My Child Knows the Topic but Still Loses Marks in GCSE Exams — Why?

A frustrating thing can happen during GCSE revision.

Your child seems to know the topic. They can explain it at home, recognise it in their revision guide and even answer straightforward questions correctly.

Then they sit an exam, and marks disappear.

Parents often respond with:

“But you knew this.”

And sometimes the child did.

The problem is that an exam does not only ask:

“Do you know it?”

It also asks whether they can recognise what the question wants, apply the right knowledge and show their answer in a way that earns the marks.

A useful way to think about this is:

A pupil can be strong at the first stage and still lose marks at any of the next three.

KNOW: Is the Knowledge Actually Secure?

The obvious first question is still worth asking properly.

Recognising a page in a revision guide is not the same as recalling the information without it. Following an explanation is not the same as explaining it independently. Remembering something right after revision is not the same as retrieving it several days later.

A better check than “Do you know this topic?” is:

Can they explain it, use it and retrieve it without the notes in front of them?

If not, the knowledge may be familiar rather than secure.

But sometimes the knowledge genuinely is there — and the marks are being lost later in the process.

RECOGNISE: Do They Understand What the Question Is Actually Asking?

This is where many capable pupils lose marks.

They know plenty about a topic but answer the question they expected rather than the one on the page.

Command words matter because they tell pupils what kind of response is required. In GCSE Science, for example:

• Describe: asks for an accurate account.
• Explain: requires giving reasons.
• Compare: requires similarities and/or differences, rather than writing about only one thing.
• Evaluate: requires considering evidence before reaching a judgement.
• Suggest: asks pupils to apply their understanding to a new situation.

The same principle applies in English. Being asked to analyse, compare, evaluate or support an interpretation means doing genuinely different things.

Before answering, a pupil needs to work out:

• What topic is the question about?
• What is the command word asking for?
• What does the answer actually need to do?

Knowing the topic is not enough if the pupil misreads the task.

APPLY: Can They Use What They Know When the Question Looks Unfamiliar?

Revision often makes knowledge look tidy.

A section labelled “photosynthesis” or “simultaneous equations” tells the pupil exactly which skill to use.

An exam does not always offer that comfort.

The relevant information may be hidden inside a graph, a practical scenario, an unfamiliar text or a multi-step problem. The pupil has to recognise it and transfer their knowledge into a new situation.

A pupil may solve percentage questions easily under a worksheet heading that says “percentages”, but not recognise that percentage change is needed inside a worded problem.

A pupil may know the definition of diffusion but struggle to use it to explain a biological situation they have not seen before.

This is application.

Sometimes the pupil does not need more knowledge. They need more practice using existing knowledge when the route is not obvious.

SHOW: Does the Answer Demonstrate Enough to Earn the Marks?

A pupil can have the right idea in their head without putting enough of it on the page.

In English Language, for example, pupils are assessed on interpreting information, analysing writers’ methods, comparing perspectives, evaluating texts and supporting responses with evidence.

“I understood the text.”

is not enough on its own.

The examiner can only award marks for what the response demonstrates.

The same principle applies elsewhere.

In Science, a pupil may know the reason but write only a description.

In maths, a correct final answer can receive full marks without shown working unless the question or marking requirements specifically require the working to be shown, for example “you must show your working” or “show that”.

Do not just think the answer — show the examiner the thinking needed for the marks.

The Answer Can Be Correct in Your Child’s Head but Incomplete on the Page

This is often hard for pupils to accept.

They leave an exam saying:

“I knew that.”

And they may genuinely have.

But the examiner can only award marks for what the response demonstrates, not what was in the pupil’s head.

Marks may be lost when:

• An explanation stops one step too early.
• Evidence is given without being explained.
• A comparison covers only one side.
• A Science answer states what happened but not why.
• A calculation misses a required unit.
• An English paragraph quotes something without analysing it
• The pupil answers generally instead of using the information the question actually supplied

That is not always a knowledge problem. It can be a problem with communicating knowledge in the form the question requires.

Why Doing More Full Papers Is Not Always the First Answer

Past papers are genuinely useful.

But simply completing more of them can become another form of repetition if nobody studies where the marks were actually lost.

After a paper, do not look only at the score. Look at the mistakes themselves and work through KNOW → RECOGNISE → APPLY → SHOW for each one.

Into something specific and fixable:

“Most of those marks are being lost because your explanations stop before the reason is fully developed.”

One Mark at a Time Matters

A higher mark can come from recovering several smaller marks that were already within reach:

• One because a command word was read carefully.
• One because a required unit was included.
• Two because an explanation was developed properly.
• One because evidence was linked back to the question.
• One because the pupil did not abandon a difficult question immediately.

Individually, these look small. Across a full paper, they add up.

The aim is not to chase marks with tricks. It is to help a pupil show more accurately what they genuinely know and can do.

What Parents Can Ask

You do not need to know the GCSE specification yourself. A few questions can help:

• What did the question actually ask you to do?
• Did you know the topic?
• Was the problem knowing the answer or explaining it?
• What did the mark scheme want that your answer did not show?
• If you saw a similar question tomorrow, what would you change?

The aim is not to interrogate your child after every test. It is to help them become more precise about why marks are being lost.

If your concerns are broader than exam performance — for example communication, concentration, behaviour or wider learning needs — speak to your child’s teacher or the school’s SENCO.

When Targeted Support May Help

If your child seems to know much of the course but their exam marks stay lower than expected, more revision content is not always the answer.

At Improve Tuition, we look at a pupil’s actual working to see where marks are being lost — not just how much they have revised, but what is stopping what they know from becoming marks on the page.

Improve Tuition provides maths, English and Science tuition for pupils from Year 2 to A-Level, with face-to-face tuition at our Batley head office and centres in Dewsbury and Ravensthorpe, plus live online support.