Killer Plants in the Classroom: What Sundews, Venus Flytraps and Pitcher Plants Teach Us About Evolution

There are some plants that immediately catch a student’s imagination. A daffodil is useful. A geranium is familiar. A broad bean seedling is good for showing growth. But put a Venus flytrap, a sundew or a pitcher plant on the bench and suddenly the whole room changes.

Students lean forward.

They ask questions.

“Does it really eat flies?”

“Can it bite you?”

“Why would a plant need to catch insects?”

That is the magic of carnivorous plants. They look like something from science fiction, but they are real, living examples of evolution, adaptation, plant physiology and ecology. They are not just curiosities. They are excellent teaching tools.

Plants That Break the Rules — Or Seem To

Most students learn early on that plants make their own food by photosynthesis. They use light energy, carbon dioxide and water to make glucose. So the idea of a plant “eating” an insect feels wrong.

But carnivorous plants are not eating insects in quite the same way that animals eat food.

They still photosynthesise. They are still plants. They still need light. What they are short of is not usually energy, but nutrients, particularly nitrogen and minerals. Many carnivorous plants grow in bogs, wetlands or poor acidic soils where ordinary plants struggle to obtain enough nutrients from the ground.

So evolution has found a different route.

Instead of relying only on the soil, these plants have developed specialised leaves that trap and digest small animals, usually insects. The insect becomes a nutrient supplement.

In teaching terms, this is a perfect moment. Students already know that plants need minerals. They already know that animals contain protein. Now they can connect the two ideas and see why a plant might benefit from catching prey.

Evolution in Action

Carnivorous plants are a wonderful example of adaptation.

They did not suddenly decide to become insect-eaters. Evolution does not work like that. Instead, small variations that helped certain plants survive in poor conditions were favoured over many generations.

A slightly stickier leaf might trap more insects.

A deeper leaf might hold rainwater and drowned insects.

A leaf with more digestive enzymes might gain more nutrients.

A plant that gained nutrients from trapped insects could survive better, grow stronger and produce more seeds. Over time, these small advantages could produce very unusual structures.

The Venus flytrap did not need to know what it was doing. Natural selection did the work.

This helps students move beyond the simplistic idea that animals or plants “try” to evolve. Evolution is not about effort. It is about variation, selection and inheritance.

The Sundew: A Sticky Trap

The sundew is one of the most beautiful carnivorous plants to show students.

Its leaves are covered in tiny red or green tentacles, each tipped with a glistening droplet. The droplets look like dew, which is where the plant gets its name. But this “dew” is sticky mucilage.

To an insect, it may look like a tempting source of moisture or nectar. Once it lands, it becomes trapped.

The more the insect struggles, the more contact it makes with the sticky hairs. Some sundew leaves slowly curl around the prey, increasing the surface area in contact with the insect. Digestive enzymes then help break down the prey and release nutrients.

This is a good opportunity to discuss:

• adaptation
• specialised plant cells
• enzymes
• surface area
• slow plant movement
• the difference between energy and nutrients

Students are often surprised by the movement. They think of plants as passive and still. Sundews challenge that assumption.

The Venus Flytrap: A Plant That Counts

The Venus flytrap is probably the most famous carnivorous plant of all.

Its trap is a modified leaf with two lobes. Inside are sensitive trigger hairs. When an insect touches these hairs in the right sequence, the trap snaps shut.

This is where the biology becomes especially interesting. The plant must avoid wasting energy by closing for every raindrop, piece of dust or accidental touch. It therefore responds to repeated stimulation rather than a single random event.

In simple classroom language, the plant is not “thinking”, but it is responding to stimuli.

This makes the Venus flytrap a superb link between plant biology and nervous-system-style ideas. Students can compare it with reflexes, electrical signals and stimulus-response pathways, while remembering that plants do not have brains.

The Venus flytrap also raises excellent questions:

• Why must the trap close quickly?
• Why does the plant need trigger hairs?
• Why might repeated stimulation be useful?
• Why does the trap not close every time something touches it?
• What would happen if the trap closed too often?

These questions are much better than simply saying, “It catches flies.”

Pitcher Plants: The Pitfall Trap

Pitcher plants use a very different method.

Instead of snapping shut or sticking prey to their leaves, they form deep tube-like or jug-like structures. These are also modified leaves. The insect is attracted by colour, smell or nectar. It lands on the rim, slips on the smooth surface, falls into the liquid below and cannot easily escape.

The plant then digests the prey and absorbs the nutrients.

Pitcher plants are excellent for teaching structure and function. Every part of the trap has a job:

• the bright colour attracts prey
• the rim encourages insects to land
• the slippery surface makes escape difficult
• the deep tube holds fluid
• the digestive liquid breaks down the prey
• the plant absorbs the released nutrients

Students can draw and label a pitcher plant very effectively. It becomes a biological machine, but one produced by evolution rather than engineering.

A Practical Classroom Question: Are They Animals or Plants?

One of the most useful discussions begins with a deliberately simple question:

“If a plant eats insects, is it still a plant?”

Students quickly realise that the answer is yes.

Carnivorous plants still contain chlorophyll. They still photosynthesise. They still have roots, stems, leaves and flowers. Their prey gives them extra nutrients, not their main source of energy.

This helps students correct a common misunderstanding. Plants do not absorb “food” from the soil in the same way animals eat food. Plants make glucose using photosynthesis, but they need mineral ions for healthy growth.

Carnivorous plants make this distinction memorable.

How to Look After Carnivorous Plants

Carnivorous plants are fascinating, but they are also easy to kill if treated like ordinary houseplants.

The most common mistake is kindness.

People feed them fertiliser. They use normal compost. They water them with tap water. They poke the traps to make them close.

All of these can damage the plant.

Most carnivorous plants need conditions that imitate their natural habitat. That usually means:

• bright light
• moist conditions
• low-nutrient growing medium
• rainwater, distilled water or reverse-osmosis water
• no ordinary fertiliser
• no rich compost
• no constant handling of the traps

For students, this is a useful ecological lesson. An organism is adapted to a particular environment. Change the environment too much and the adaptation becomes a problem.

A Venus flytrap adapted to poor soil is not helped by rich compost. A bog plant is not helped by being kept dry. A plant adapted to clean rainwater may struggle with mineral-rich tap water.

Looking after the plant becomes a practical study in ecology.

A Simple Student Investigation

Carnivorous plants can lead into small, careful investigations. These do not need to involve harming the plant.

Students could investigate:

• how different carnivorous plants trap prey
• how the structure of each trap matches its function
• why low-nutrient soil encourages carnivory
• how light affects plant growth
• how water type affects long-term health
• how a Venus flytrap avoids closing unnecessarily
• how sundew tentacles respond over time

A good classroom task is to compare three trap types:

1. Sundew — sticky trap
2. Venus flytrap — snap trap
3. Pitcher plant — pitfall trap

Students can then answer:

• What attracts the insect?
• What prevents escape?
• How is the prey digested?
• What nutrients does the plant gain?
• What is the evolutionary advantage?

This gives a clear structure and helps students move from fascination to scientific explanation.

Why Students Remember Them

I have found that students remember unusual examples.

They may forget a diagram of a typical leaf. They may forget a list of mineral deficiencies. But they remember the plant that catches flies.

That memory gives the teacher something to build on.

When teaching adaptation, I can return to the Venus flytrap.

When teaching enzymes, I can return to digestion in pitcher plants.

When teaching mineral ions, I can ask why a plant would need nutrients from insects.

When teaching ecology, I can talk about bogs, wetlands and poor soils.

Carnivorous plants become a hook. They make abstract ideas visible.

The Bigger Lesson: Life Finds a Way

What makes carnivorous plants so powerful as a teaching example is that they show how flexible life can be.

A plant is rooted in one place. It cannot chase prey. It cannot hunt like a spider or a bird. Yet evolution has produced leaves that snap, leaves that stick, and leaves that form deadly cups of digestive fluid.

That is extraordinary.

It also reminds students that evolution is not about progress towards a perfect form. It is about survival in a particular environment. A cactus, an orchid, a nettle and a Venus flytrap are all successful in different ways.

The question is not “Which plant is best?”

The question is “Best for what environment?”

Conclusion: The Perfect Plant for Curious Minds

Carnivorous plants are more than classroom novelties. They are living examples of evolution, adaptation, ecology, enzymes, plant nutrition and stimulus response.

They fascinate students because they appear to break the rules. But once we study them carefully, they actually help students understand the rules more deeply.

The sundew shows us patience and stickiness.

The Venus flytrap shows us rapid response and energy-saving precision.

The pitcher plant shows us structure, attraction and entrapment.

Together, they show us that plants are far more active, complex and surprising than many students first imagine.

And perhaps that is the best reason to teach them.

A good science lesson should not just answer questions. It should create better ones.

What A Level Psychology Can Teach Us About Social Media, Sleep and Anxiety

 

Is Your Phone Training Your Brain?

What A Level Psychology Can Teach Us About Social Media, Sleep and Anxiety

There is a familiar scene in many homes.

A student sits down to revise. The textbook is open. The highlighters are ready. The notebook is neat, at least for the first ten minutes. Then the phone lights up.

One message.
One notification.
One quick check.

Before long, the revision session has become something else entirely. The student is not necessarily being lazy. They may genuinely want to work. But they are trying to revise while sitting next to one of the most powerful attention-grabbing devices ever created.

This is where A Level Psychology becomes very interesting.

Psychology is not just about unusual behaviour, famous experiments or exam essays. At its best, Psychology helps us understand ordinary behaviour: why we conform, why we compare ourselves with others, why we remember some things and forget others, why sleep matters, and why changing habits can be so difficult.

So, is your phone training your brain?

The answer is more interesting than simply saying “phones are bad”.

---

The Phone Is Not Just a Device

A phone is often described as a tool. That is true, but it is not the whole truth.

A phone is also a social space, a reward system, a source of information, a distraction machine, a camera, a diary, a messaging service, an entertainment centre, and sometimes a source of anxiety.

For young people, it can feel like the place where friendship happens. Group chats, Snapchat streaks, TikTok trends, Instagram messages and gaming communities are not separate from real life. They are part of real life.

That is why telling a teenager to “just put it away” often fails. To an adult, the phone may look like a distraction. To the teenager, it may feel like connection, status, entertainment, reassurance and belonging.

A Level Psychology gives students the language to explore this properly.

Instead of saying:

“Teenagers are addicted to their phones.”

Psychology encourages us to ask better questions:

• What rewards are keeping the behaviour going?
• What social pressures are involved?
• Is the phone affecting sleep?
• Is the student avoiding anxiety by scrolling?
• Is social media causing distress, or are distressed students using social media more?
• What is the difference between correlation and causation?

That is the value of Psychology. It slows down the argument.

---

Social Influence: Why We Check What Everyone Else Is Doing

One of the first areas students meet in A Level Psychology is social influence. This includes conformity, obedience, majority influence, minority influence and resistance to social pressure.

That might sound like something from a textbook, but it is happening every day on social media.

A teenager may not want to reply immediately to a group chat, but they may feel pressure to do so. They may not want to post a photo, but everyone else is posting. They may not even particularly like a trend, but joining in feels safer than standing apart.

This is normative social influence: the pressure to fit in and be accepted.

It is not always dramatic. It can be quiet and constant.

A student might think:

“If I don’t reply, they’ll think I’m ignoring them.”
“If I don’t know the joke tomorrow, I’ll be left out.”
“If everyone else is online, I should be too.”

This makes phone use much more complicated than simple willpower.

A useful classroom discussion might be:

Would you still use a social media app as much if no one could see whether you were online, whether you had replied, or whether you had liked something?

That question opens the door to a proper psychological discussion.

---

Memory and Attention: Why Revision and Notifications Do Not Mix

Students often believe they can revise while checking their phone.

They usually cannot.

That is not a moral failure. It is a limitation of attention and working memory.

Working memory is the mental space we use to hold and manipulate information. It is what a student uses when solving an algebra problem, balancing a chemical equation, learning a Psychology study, or planning an essay paragraph.

The problem is that working memory is limited.

Every interruption has a cost. A message does not just take five seconds. It breaks concentration, changes emotional state, and often leads to another thought:

“What did they mean by that?”
“Should I reply?”
“What if I miss something?”
“I’ll just check one more thing.”

By the time the student returns to revision, the brain has to reload the original task.

A practical demonstration is simple.

Ask a student to read a short Psychology paragraph in silence and then answer five questions. Then ask them to read a similar paragraph while being interrupted every 30 seconds by a harmless question or a simulated notification.

Most students immediately notice the difference.

They may still have been “working”, but the quality of attention has changed.

This is why one of the simplest revision strategies is also one of the hardest:

Put the phone in another room.

Not face down.
Not on silent beside the book.
Not “just for emergencies”.

In another room.

For many students, that one change improves revision more than buying another set of highlighters.

---

Sleep: The Hidden Part of Learning

When students struggle, they often look for a better revision timetable, better notes, better flashcards or better exam technique.

Sometimes the missing ingredient is sleep.

Sleep is not wasted time. It is part of learning. It helps with memory consolidation, emotional regulation and attention. A tired student is not just sleepy; they may be more irritable, more anxious, less focused and less able to retrieve information under pressure.

Phones can interfere with sleep in several ways.

There is the obvious problem of staying up too late. One video becomes ten. One message becomes a long conversation. One quick check becomes another hour awake.

But there is also the problem of emotional stimulation. A student may be physically in bed, but psychologically still in school, friendship drama, gaming, comparison, argument, entertainment or worry.

This matters.

A student who revises late into the evening, then scrolls until midnight, then sleeps badly, may feel that they are working hard but still underperforming. The problem may not be intelligence. It may be recovery.

A useful practical rule is:

The last half hour before sleep should not be the most stimulating part of the day.

That does not mean every teenager will happily give up their phone in the evening. But it gives parents and students a realistic starting point: reduce stimulation, reduce notifications, charge the phone away from the bed, and protect sleep as part of exam preparation.

---

Anxiety: Is Social Media the Cause or the Mirror?

The public debate about social media and anxiety often becomes too simple.

One side says social media is damaging young people.
Another side says young people have always worried and adults are exaggerating.

Psychology asks us to be more careful.

It may be true that some online experiences make anxiety worse. Social comparison, cyberbullying, appearance pressure, fear of missing out, and constant availability can all create stress.

But it does not automatically follow that screen time itself is the cause of anxiety.

This is where A Level Psychology students learn one of the most important ideas in research methods: correlation is not causation.

If anxious teenagers use social media more, there are several possible explanations.

Social media might increase anxiety.
Anxious teenagers might use social media more for reassurance or distraction.
A third factor, such as loneliness, school pressure or poor sleep, might influence both anxiety and phone use.

This is why good Psychology is cautious.

A headline might say:

“Social media linked to teenage anxiety.”

But a Psychology student should ask:

What kind of study was it?
How was anxiety measured?
How was phone use measured?
Was it self-report?
Was it longitudinal?
Did the study show cause and effect?
Were there individual differences?

That is not just exam technique. It is a life skill.

---

The Problem With “Screen Time”

Parents often ask: “How much screen time is too much?”

It is an understandable question, but it may not be the best question.

One hour spent video-calling a grandparent is not the same as one hour being bullied online.
One hour researching a school project is not the same as one hour comparing your appearance with edited images.
One hour creating music, coding, drawing or editing video is not the same as one hour of passive scrolling.

The number of hours matters, especially if it replaces sleep, exercise, homework or real-life relationships. But quality matters too.

A better question might be:

What is the phone use doing to the student?

Is it helping them connect?
Is it helping them create?
Is it helping them learn?
Is it helping them relax?

Or is it making them more distracted, more anxious, more tired and less confident?

That is the sort of question Psychology is good at asking.

---

The Reward System: Why Apps Are Hard to Ignore

Phones are designed to be checked.

Notifications, likes, comments, streaks, short videos and infinite scrolling all create repeated opportunities for reward.

The reward is not always large. Sometimes it is tiny: a message, a like, a funny clip, a new update, a small feeling of being noticed.

But small rewards can be powerful when they are unpredictable.

This is one reason students find phones hard to resist. They are not just choosing between “revision” and “distraction”. They are choosing between a difficult long-term reward and an easy short-term reward.

Revision gives the reward later.

The phone gives the reward now.

That is not an excuse, but it is an explanation. Once students understand the mechanism, they can start to design better habits.

For example:

• Keep the phone away during deep revision.
• Use a timer for focused work.
• Check messages during planned breaks.
• Turn off non-essential notifications.
• Remove the most distracting apps from the home screen.
• Charge the phone outside the bedroom.
• Use another device, such as a laptop, for schoolwork where possible.
• Make the desired behaviour easier and the distracting behaviour harder.

In Psychology terms, we are changing the environment so that the behaviour is easier to control.

---

A Personal Reflection From Teaching

In tuition, I often see students who are perfectly capable but cannot maintain concentration for long enough to show what they know.

This is especially obvious when working through exam questions.

A student may understand a topic when we discuss it aloud. They may be able to explain a concept, remember a study or identify the correct theory. But when they have to sit quietly, read the question carefully, plan an answer and write in a structured way, the attention demands become much greater.

That is where phones can become a hidden problem.

The issue is not always that the student is using the phone during the lesson. Sometimes it is the habit the phone has trained: fast switching, constant stimulation, shallow attention and discomfort with silence.

Exams require something very different.

Exams reward sustained attention.
They reward careful reading.
They reward planning.
They reward memory retrieval.
They reward resisting the urge to rush.

Those skills can be rebuilt, but they need practice.

One thing I often remind students is:

Revision is not just learning the subject. It is training the brain to sit with the subject for long enough to think properly.

That is difficult if every quiet moment is filled with a screen.

---

What A Level Psychology Students Can Learn From This

This topic is excellent for A Level Psychology because it connects so many parts of the course.

Social influence helps explain peer pressure, conformity and the need to belong.

Memory helps explain why interruptions damage revision.

Biopsychology can link to arousal, sleep, stress and the nervous system.

Clinical psychology and mental health help students think carefully about anxiety, mood and functioning.

Research methods help students judge whether claims are supported by evidence.

Issues and debates help students consider determinism, individual differences, cultural changes and the ethical responsibilities of technology companies.

A student who can write about phones, sleep and anxiety using proper psychological language is doing more than discussing social media. They are showing that they can apply Psychology to real life.

That is exactly what good A Level work requires.

---

Practical Advice for Students

Here are some realistic steps that can help.

1. Do the hardest work away from the phone

If you are writing an essay, learning studies, doing calculations or practising exam questions, the phone should not be beside you.

2. Use breaks properly

A break should refresh you. If five minutes of scrolling turns into twenty minutes of comparison, argument or distraction, it has not worked as a break.

3. Protect sleep before exams

Sleep is part of revision. A tired brain does not retrieve information well.

4. Notice how different apps make you feel

Some online activity is useful. Some is harmless. Some leaves you feeling worse. Learn the difference.

5. Practise silence

This sounds strange, but it matters. Students need to become comfortable with quiet concentration again.

6. Replace, do not just remove

If a student removes phone use, something needs to replace it: reading, walking, sport, music, making something, talking to someone, or proper rest.

---

Practical Advice for Parents

Parents often feel they have only two options: ignore the phone problem or start a battle.

There is a better middle ground.

Start with sleep and revision, not moral panic.

Instead of saying:

“You are always on that phone.”

Try:

“Let’s make sure the phone is not stopping you sleeping or revising properly.”

That is a more useful conversation.

Parents can also model the behaviour themselves. It is difficult to persuade a teenager to reduce phone use if adults are constantly checking messages during meals, conversations and family time.

A household phone routine may work better than a teenager-only rule.

For example:

• No phones at the dinner table.
• Phones charged away from beds.
• Focus time during homework.
• Notifications off during family activities.
• A shared understanding that sleep matters.

This turns the issue from punishment into habit design.

---

So, Is Your Phone Training Your Brain?

Yes, in some ways it probably is.

It may be training you to expect constant stimulation.
It may be training you to switch tasks quickly.
It may be training you to seek quick rewards.
It may be training you to feel uncomfortable when nothing is happening.

But the brain can also be trained in the other direction.

It can be trained to focus.
It can be trained to read deeply.
It can be trained to revise properly.
It can be trained to sleep better.
It can be trained to pause before reacting.
It can be trained to use technology rather than be used by it.

That is why this is such a good topic for A Level Psychology.

It is not just about phones. It is about behaviour, attention, memory, social pressure, mental health and evidence.

In other words, it is about being human in a world that is constantly asking for your attention.

The phone may be training your brain.

The important question is whether you want to start training it back.

 

A Level Computing Projects: Why a Retro Platform Game Might Be the Perfect Place to Start

Every year, when A Level Computer Science project season begins, students arrive with big ideas.

Very big ideas.

A fully 3D open-world game.
A multiplayer online battle system.
A PlayStation-style adventure.
A physics-based driving game.
A first-person shooter with realistic graphics, enemies, weapons, levels, menus, sound effects, online scoring and perhaps a little bit of artificial intelligence thrown in for good measure.

The ambition is wonderful. It is also usually completely unrealistic.

That is not because the students are not capable. It is because many students have played modern games for years without ever seeing how much work sits underneath them. A game that feels simple to play may involve teams of artists, programmers, sound designers, testers, level designers, animators and project managers.

An A Level project is not about building the next commercial games franchise. It is about producing a well-planned, well-documented, achievable piece of software that solves a defined problem and allows the student to show evidence of analysis, design, development, testing and evaluation.

Last year, I wrote a series of blog articles on building a text adventure game. Several of my students used the ideas, adapted them, and created their own versions. It worked well because a text adventure has structure, logic, data, choices, files, testing and plenty of scope for extension without needing complex graphics.

This year, we are going to move one step further.

We are going to look at building a simple retro-style platform game.

Not the latest console blockbuster. Not a 3D world with cinematic cut-scenes. A simple 2D platform game: a player, platforms, gravity, jumping, hazards, scoring, levels and a clear objective.

Retro, yes. Simple, no.

A platform game is a brilliant A Level project idea because it looks achievable, but it quickly introduces some very serious programming problems.

And that is exactly why it is worth doing.

Why Students Often Start With the Wrong Game Idea

When students first suggest writing a game, they often describe the game from the player’s point of view.

They talk about the world, the characters, the powers, the enemies, the graphics and the story. They describe what they want it to feel like.

That is natural. It is how players think.

But programmers have to think differently.

A programmer has to ask:

How will the character move?
How will the program know when the character lands on a platform?
How will gravity work?
What happens when the player hits the side of a wall?
How are levels stored?
How is the score calculated?
How will the program know when the game is over?
How will testing be recorded?
How will the project be extended without becoming impossible?

This is where many students begin to see the difference between an idea and a project.

A Level project work needs more than enthusiasm. It needs structure.

Why a Platform Game Is a Good Compromise

A retro platform game sits in a useful middle ground.

It is more visual and exciting than a text-only program, but it does not require the impossible workload of a modern 3D game.

A good simple platform game can include:

• a player character
• left and right movement
• jumping
• gravity
• platforms
• hazards
• collectable items
• a score system
• multiple levels
• enemies or moving obstacles
• a menu screen
• saved high scores
• difficulty settings
• user testing and feedback

That gives the student plenty to write about in the project documentation.

It also gives the student real programming challenges. The project is not just about drawing something on the screen. It involves logic, problem-solving, data handling, algorithms and testing.

That is what makes it useful.

Start With the Simplest Possible Version

The biggest mistake is trying to build the finished game first.

A better approach is to build the smallest possible version of the game and then improve it gradually.

The first version might have:

• a square representing the player
• one flat platform
• basic left and right movement
• a simple jump
• gravity pulling the player down

That is enough for the first prototype.

No enemies.
No music.
No story.
No menu.
No beautiful graphics.
No complicated level design.

Just movement, gravity and landing.

It may look unimpressive, but it contains the foundation of the entire game.

Once the player can move, jump and land properly, the project can grow.

The First Real Problem: Movement

Movement sounds easy.

Press the right arrow, move right.
Press the left arrow, move left.

But even this raises questions.

Should the player move at a constant speed?
Should movement feel instant or gradual?
Can the player change direction in mid-air?
Should there be acceleration?
Should the player stop immediately when the key is released?

For a simple first version, the player might move a fixed number of pixels each frame. That is enough to get started.

Later, the student can improve this with velocity, acceleration and friction.

This creates an excellent development trail for the project write-up. The student can show how the first version worked, what its limitations were, and how later versions improved the behaviour.

That is exactly the kind of evidence A Level projects need.

The Second Problem: Gravity

Gravity is where the game starts to feel like a platform game.

Without gravity, the character simply moves around the screen. With gravity, the player falls, lands and jumps.

A simple gravity system might work like this:

• the player has a vertical velocity
• gravity increases the downward velocity each frame
• when the player jumps, the vertical velocity is set upwards
• as gravity continues to act, the player slows, stops, then falls
• when the player touches the ground, the vertical velocity returns to zero

This gives students a chance to use physics-style thinking in programming.

It also teaches an important lesson: games are often built from approximations. We do not need a perfect model of real-world gravity. We need a model that feels right and works reliably.

The Third Problem: Collision Detection

Collision detection is one of the most important parts of a platform game.

The program must know when the player touches a platform, hits a wall, falls off the screen, collects an item or collides with an enemy.

At first, students often think this will be simple.

Then they discover the awkward cases.

What happens if the player lands on the top of a platform?
What happens if the player hits the underside of a platform while jumping?
What happens if the player hits the side of a wall?
What happens if the player moves so quickly that they pass through a thin platform between frames?
What happens at corners?

This is where a “simple” platform game becomes a proper programming project.

A good starting point is rectangle collision detection. The player can be represented as a rectangle. Platforms can also be rectangles. The program then checks whether the rectangles overlap.

That is not perfect, but it is a very good place to begin.

The Fourth Problem: Level Design

Once movement and collision detection work, the next question is how to create levels.

The simplest version might hard-code a few platforms into the program.

For example:

Platform 1: x = 0, y = 500, width = 800, height = 40
Platform 2: x = 200, y = 400, width = 150, height = 20
Platform 3: x = 450, y = 320, width = 150, height = 20

That works for a prototype.

But for a stronger project, students can think about better ways to store level data.

Could levels be stored in a list?
Could they be loaded from a file?
Could a level editor be created?
Could different levels have different themes, hazards or difficulty?

This is where the project becomes much more interesting from an A Level point of view.

The student is no longer just writing a game. They are designing a system.

The Fifth Problem: Keeping the Scope Under Control

A platform game can grow very quickly.

Once the basic game works, students often want to add everything.

Enemies.
Power-ups.
Moving platforms.
Ladders.
Water.
Doors.
Keys.
Boss fights.
Multiple characters.
Sound effects.
Animation.
Menus.
Saving.
Online leaderboards.

Some of these are good extensions. Too many of them become a problem.

A successful A Level project needs a clear scope. The student should decide what is essential, what is desirable and what is only an extension if time allows.

A sensible feature plan might look like this:

Essential Features

• player movement
• jumping and gravity
• platforms
• hazards
• score
• win and lose conditions
• at least two playable levels

Desirable Features

• collectable items
• moving enemies
• start menu
• high score table
• basic sound effects

Extension Features

• level editor
• multiple characters
• animated sprites
• difficulty settings
• saved progress
• user-created levels

This helps the project stay achievable.

It also gives the student something valuable to discuss in the evaluation: what was completed, what changed, what worked and what could be improved.

Why Documentation Matters as Much as the Code

Many students think the project is mainly about programming.

It is not.

The programming matters, of course, but the marks also depend heavily on the evidence around the programming.

Students need to show:

• what problem they are solving
• who the users are
• what success criteria they set
• how the program was designed
• how the program was developed
• how problems were solved
• how testing was carried out
• how feedback was used
• how the final project was evaluated

A simple but well-documented project can often be stronger than an overambitious project that is unfinished and poorly explained.

This is why a platform game can work well. It gives the student visible progress, clear testing opportunities and plenty of technical problems to discuss.

Practical Example: A First Week Target

For the first week, the target should not be “make the game”.

That is too vague.

A better first-week target could be:

Create a basic game window with a player block that can move left and right, fall under gravity, jump from the floor, and land without falling through it.

That is a proper target.

It can be tested.

The student can record:

• what keys control the player
• whether movement works
• whether gravity works
• whether the player lands correctly
• whether jumping feels too high or too low
• what happens at the edges of the screen
• what bugs were found
• what changes were made

This is how the project evidence begins.

The Hidden Teaching Value of a Platform Game

A platform game teaches much more than game design.

It teaches students how to break a problem down.

It teaches iteration.
It teaches testing.
It teaches debugging.
It teaches planning.
It teaches the danger of overcomplicating a project too early.
It teaches students to separate what they want from what they can realistically build.

That last lesson is one of the most important.

A Level Computer Science projects are often the first time students have to manage a large piece of independent software development. They need to make decisions, justify those decisions and cope when the first version does not work.

A platform game will certainly produce bugs.

The player will fall through the floor.
The jump will feel wrong.
The character will get stuck in platforms.
The score will not reset properly.
The collision detection will behave strangely at the edges.
The levels will be too easy or impossible.

That is not failure.

That is the project.

What We Will Cover in This Series

This blog is the starting point.

Over the next few weeks, we can develop the idea step by step, looking at how a simple platform game can be designed, built, tested and improved.

Possible articles in the series include:

1. Planning the platform game and setting realistic success criteria
2. Creating the game window and player movement
3. Adding gravity and jumping
4. Building platforms and collision detection
5. Designing levels and storing level data
6. Adding hazards, enemies and collectables
7. Creating scoring, lives and win conditions
8. Testing the game properly
9. Improving graphics, sound and user experience
10. Writing up the project for A Level evidence

Each article can focus on one manageable part of the project.

That is exactly how students should approach the work itself: one problem at a time.

Final Thoughts: Retro Does Not Mean Easy

A retro platform game may look simple, but it contains many of the same ideas found in much larger software projects.

There is user input.
There is data.
There is logic.
There are rules.
There are errors to find.
There are design decisions to justify.
There is testing to record.
There is evaluation to write.

That makes it a very useful A Level project idea.

The aim is not to build the next PlayStation or Xbox game. The aim is to build something achievable, expandable and well understood.

A simple platform game can start with one square jumping on one platform.

From there, it can become a proper project.

And that is where good Computer Science begins: not with the biggest idea, but with the first working version.

 

What Is the Best Way to Revise for a GCSE Chemistry Test?

GCSE Chemistry revision can feel rather uncertain. Students often know that equations will appear, calculations are likely, and, because it is AQA, one of the required practicals is almost certain to be involved somewhere. But that still leaves a large question:

How do you revise for the rest of Chemistry?

This is where many students go wrong. They read through their notes, highlight a few pages, watch a video, and then hope that the right facts have somehow gone into their memory. Unfortunately, Chemistry does not usually reward vague familiarity. It rewards students who can explain, apply, calculate, compare, and describe methods clearly.

The best Chemistry revision is not just about remembering facts. It is about learning how Chemistry questions work.

---

Chemistry Is Not Revised by Reading Alone

One of the biggest mistakes students make is treating Chemistry like a subject that can be revised passively. They sit with the textbook open and feel reassured because the page looks familiar.

But recognition is not the same as recall.

A student may look at a page on electrolysis and think, “Yes, I know this.” Then the test asks:

Why is aluminium extracted by electrolysis rather than reduction with carbon?

Suddenly, the student realises that “I know this” was not quite enough.

A better test is to close the book and ask:

• Can I explain this without looking?

• Can I write the equation?

• Can I answer a six-mark question on it?

• Can I connect it to a required practical?

• Can I use the data if they give me a graph or table?

That is real revision.

---

Start with Equations: They Are the Language of Chemistry

If there will be equations on the test, balancing equations is a very good place to start. However, students should not treat balancing as a small isolated skill. Balanced equations are central to understanding Chemistry because they show what reacts, what is formed, and how atoms are conserved.

For example:

Magnesium + oxygen → magnesium oxide

The word equation becomes:

Mg + O₂ → MgO

But this is not balanced because there are two oxygen atoms on the left and only one on the right.

So we balance it:

2Mg + O₂ → 2MgO

A simple revision activity is to practise five equations every day. Start with word equations, then convert them into symbol equations, then balance them.

Useful GCSE examples include:

Acid + metal → salt + hydrogen

Example:

magnesium + hydrochloric acid → magnesium chloride + hydrogen

Mg + 2HCl → MgCl₂ + H₂

Acid + carbonate → salt + water + carbon dioxide

Example:

calcium carbonate + hydrochloric acid → calcium chloride + water + carbon dioxide

CaCO₃ + 2HCl → CaCl₂ + H₂O + CO₂

Combustion of hydrocarbons

Example:

methane + oxygen → carbon dioxide + water

CH₄ + 2O₂ → CO₂ + 2H₂O

Balancing equations is not just a calculation trick. It is Chemistry’s way of saying that atoms are not lost or made during a chemical reaction.

---

Do Not Just Learn Equations — Learn Reaction Families

Students often try to memorise individual reactions one by one. This is much harder than learning the pattern.

For GCSE Chemistry, many reactions belong to families:

1. Acids reacting with metals

acid + metal → salt + hydrogen

Look for bubbles. The gas produced is hydrogen. The test for hydrogen is a squeaky pop with a lit splint.

2. Acids reacting with carbonates

acid + carbonate → salt + water + carbon dioxide

Look for fizzing. The gas produced is carbon dioxide. The test is that it turns limewater cloudy.

3. Acids reacting with alkalis

acid + alkali → salt + water

This is neutralisation. It links directly to titration and pH.

4. Combustion

A hydrocarbon burning completely produces carbon dioxide and water.

Incomplete combustion may produce carbon monoxide and carbon, which is why it is dangerous and why it links to pollution.

5. Electrolysis

Electrolysis is not just “electricity through a solution”. It is about ions moving to electrodes, gaining or losing electrons, and forming new substances.

Once students learn the reaction families, unfamiliar questions become much less frightening.

---

Calculations: Practise the Method, Not Just the Formula

There will almost certainly be calculations in a GCSE Chemistry test. Some students revise calculations by writing out formula triangles. That may help a little, but it is not enough.

Chemistry calculations need practice because the difficulty is often not the arithmetic. The difficulty is knowing what the question is asking.

Good areas to revise include:

• relative formula mass

• moles

• reacting masses

• concentration

• percentage by mass

• percentage yield

• atom economy

• rate of reaction

• Rf values in chromatography

• mean values from practical data

• gradients from graphs

A good revision method is to use this four-step calculation structure:

Step 1: Write down the information given

Do not rush. Identify numbers, units, substances, and what the question wants.

Step 2: Write the equation or formula

For example:

moles = mass ÷ Mr

or

concentration = mass ÷ volume

or

Rf = distance moved by substance ÷ distance moved by solvent

Step 3: Substitute carefully

Use the correct units. Watch out for cm³ and dm³. This is a very common GCSE mistake.

Step 4: Check the answer

Ask: does the answer make sense? Have I rounded correctly? Have I included units?

A student who practises ten Chemistry calculations properly will usually improve more than a student who simply reads through twenty pages of notes.

---

Required Practicals: Learn the Story, Not Just the Method

AQA required practicals often appear in tests because they examine several skills at once. They can test method, apparatus, safety, variables, graph work, accuracy, errors, conclusions, and improvements.

The mistake many students make is learning practicals as a recipe:

“Add this, then heat that, then filter this.”

That is not enough.

Students need to understand the story of the practical.

For each required practical, students should be able to answer:

1. What is the aim?

2. What equipment is used?

3. What is the independent variable?

4. What is the dependent variable?

5. What control variables are needed?

6. What safety precautions are important?

7. What results would be collected?

8. What graph might be drawn?

9. What conclusion would be expected?

10. What could go wrong?

11. How could the method be improved?

For example, in the soluble salts practical, students should know why an excess of insoluble base is added. It is not just a step to remember. It ensures all the acid has reacted. Then the excess solid can be removed by filtration, leaving the salt solution behind.

That is the kind of detail that gains marks.

---

Practical Example: Making a Soluble Salt

A typical practical question might ask how to prepare a pure, dry sample of copper sulfate crystals.

A strong answer would include:

• warm dilute sulfuric acid

• add copper oxide until it is in excess

• stir to allow the reaction to occur

• filter to remove excess copper oxide

• gently heat the filtrate to evaporate some water

• leave the solution to crystallise

• dry the crystals using filter paper

A weaker answer might simply say:

“Mix acid and copper oxide and evaporate it.”

The difference is not that the student knows a completely different practical. The difference is precision.

Chemistry marks are often awarded for precise scientific steps.

---

Practical Example: Titration

Titration is a good example of where students can know the general idea but lose marks on detail.

Students should know:

• the acid or alkali is measured using a pipette

• the other solution is placed in a burette

• an indicator is used

• the solution is added slowly near the endpoint

• concordant results are used

• the rough titre is not normally included in the mean

But they also need to understand why.

The burette allows accurate measurement of the volume added. The indicator shows the endpoint. Repeating the titration improves reliability. Concordant results show that the experiment has been carried out consistently.

This is where practical understanding becomes exam performance.

---

The “Rest” of Chemistry: Revise by Big Ideas

Once equations, calculations, and required practicals have been revised, students often ask, “What about everything else?”

The answer is to revise Chemistry through big ideas.

Big Idea 1: Structure Determines Properties

This applies to bonding, materials, nanoparticles, graphite, diamond, metals, ionic compounds, and polymers.

Instead of learning separate facts, students should practise explaining the link:

structure → bonding → properties → use

For example:

Diamond is hard because each carbon atom forms four strong covalent bonds in a giant covalent structure.

Graphite conducts electricity because it has delocalised electrons between layers.

Ionic compounds have high melting points because strong electrostatic forces between oppositely charged ions require a lot of energy to overcome.

This pattern appears again and again.

---

Big Idea 2: Particles Explain Observations

Many Chemistry answers improve when students explain things using particles.

For example:

A higher concentration increases the rate of reaction because there are more reacting particles in the same volume, so collisions happen more frequently.

A higher temperature increases the rate because particles have more energy, move faster, and a greater proportion of collisions have enough energy to react.

A catalyst increases the rate by providing an alternative reaction pathway with a lower activation energy.

These are not just facts. They are explanations.

Students should practise using the word because. It forces the answer to become scientific.

---

Big Idea 3: Reactivity Explains Extraction and Displacement

The reactivity series is not just a list to memorise. It explains why metals behave differently.

A more reactive metal will displace a less reactive metal from its compound.

Carbon can reduce oxides of metals less reactive than carbon.

Very reactive metals, such as aluminium, are extracted by electrolysis because they are too reactive to be reduced using carbon.

If students understand the pattern, they can answer questions even when the metal is unfamiliar.

---

Big Idea 4: Energy Changes Explain Temperature Changes

Students often remember that exothermic means “gives out heat” and endothermic means “takes in heat”, but they need to go further.

Exothermic reactions transfer energy to the surroundings, so the temperature of the surroundings increases.

Endothermic reactions take in energy from the surroundings, so the temperature of the surroundings decreases.

For higher marks, students may need to explain bond breaking and bond making:

• energy is needed to break bonds

• energy is released when bonds form

• if more energy is released than taken in, the reaction is exothermic

• if more energy is taken in than released, the reaction is endothermic

Again, the revision method should be explanation, not just memorisation.

---

Use Past Questions Early, Not at the End

Many students leave past questions until the night before the test. That is usually too late.

Past questions should be used early because they show how the topic is examined.

A good method is:

1. Revise one small topic.

2. Do five exam questions on that topic.

3. Mark them carefully.

4. Write down what the mark scheme wanted.

5. Redo the questions a few days later.

The important part is not just getting a score. The important part is learning the language of the mark scheme.

For example, students often write:

“The particles collide more.”

But the mark scheme may want:

“The particles collide more frequently.”

That difference matters.

---

The Best 30-Minute Revision Session

A useful Chemistry revision session does not need to be three hours long. In fact, shorter, focused sessions are often better.

A strong 30-minute session could look like this:

5 minutes: Quick recall

Write down everything you can remember about one topic without looking.

10 minutes: Learn and correct

Use notes, revision guides, or lesson materials to correct gaps.

10 minutes: Exam questions

Complete a small set of questions without notes.

5 minutes: Mark and improve

Correct mistakes in a different colour and write one sentence explaining what went wrong.

This is much better than 30 minutes of passive highlighting.

---

A Simple 7-Day Plan Before a Chemistry Test

Day 1: Equations and reaction types

Practise word equations, symbol equations, and balancing.

Day 2: Calculations

Focus on moles, concentration, reacting masses, Rf values, rates, and percentage calculations.

Day 3: Required practicals

Make one-page summaries of the practicals likely to appear.

Day 4: Bonding and structure

Practise explaining properties using structure and bonding.

Day 5: Chemical changes and energy changes

Revise acids, electrolysis, reactivity, exothermic and endothermic reactions.

Day 6: Exam questions

Complete a mixed set under timed conditions.

Day 7: Error correction

Do not just revise everything again. Revise what went wrong.

The final day before a test should be about fixing weaknesses, not pretending they are not there.

---

Personal Reflection: What I See in Lessons

In tuition lessons, I often find that students are not weak because they cannot learn Chemistry. They are weak because they revise Chemistry in the wrong way.

They know the title of the topic, but not the explanation.

They remember doing the practical, but not why each step mattered.

They can sometimes balance an equation, but cannot connect it to conservation of mass.

They can use a formula when told which one to use, but struggle when the question hides the calculation inside a paragraph.

This is why practical work is so important. When a student has actually made a salt, carried out a titration, watched electrolysis happen, or seen a temperature change during a reaction, Chemistry becomes less like a list of facts and more like something real.

Revision then has something to attach to.

---

The Best Way to Revise GCSE Chemistry

The best way to revise for a GCSE Chemistry test is to combine five things:

1. Practise equations until balancing becomes automatic.

2. Practise calculations until the method is clear.

3. Learn required practicals as stories with reasons, not recipes.

4. Revise big ideas such as particles, bonding, energy, and reactivity.

5. Use exam questions to learn how AQA asks and marks questions.

Chemistry revision should be active. Students should write, explain, calculate, draw, correct, and repeat.

Reading notes may feel comfortable, but comfort is not the same as progress.

The real test of revision is simple:

Can you close the book and explain the Chemistry clearly?

If the answer is yes, you are revising properly.