GCSE Physics: Why Students Struggle and How to Fix It
Updated: Aug 21
TL;DR: Physics is the science most students describe as their hardest, and the reason is rarely a lack of intelligence or effort. GCSE Physics sits on top of maths skills that many students have never been taught to apply outside a maths lesson, it rewards understanding over memorisation, and its exam papers punish weak technique more than any other science. The good news is that each of these problems has a specific fix. This guide breaks down the four reasons students struggle in physics, what is actually causing each one, and what to do about it, whether your child is aiming to secure a pass or pushing for a grade 9 and an A-level place.
Key Takeaways
Most physics underperformance is a maths problem in disguise. Rearranging equations and handling units cost more marks than missing knowledge.
Memorising formulae without understanding the concepts behind them works in Year 9 and collapses in Year 11. Understanding has to come first.
Long-answer and six-mark questions are marked on structure and command words, not effort. Technique here is learnable and fast to improve.
Physics is one of the GCSEs with the biggest jump to A-level, so fixing weak foundations now protects sixth-form options later.
If your child says "I am just not good at physics", treat it as a signal to diagnose, not a verdict to accept.
Ask a group of GCSE students to name their hardest subject and physics comes up more than any other science. Parents hear it at home in a familiar phrase: "I understand it in class, but I cannot do the questions."
That sentence is worth taking seriously, because it describes the real problem precisely. The student is not failing to pay attention. Something breaks down between understanding an idea and applying it under exam conditions.
In our experience, that breakdown almost always traces back to one of four causes. None of them is a lack of ability, and all of them respond quickly to the right kind of support.
Here is what is actually going wrong, and how to fix each one.
1. The Maths Problem Hiding Inside Physics
The struggle: a student who seems fine on the concepts keeps losing marks on calculation questions. Wrong rearrangements, missing units, answers out by factors of ten.
The cause: GCSE Physics is the most mathematical of the three sciences. Rearranging equations, converting units, working with standard form and interpreting graphs are all maths skills, but they are examined in a physics context that students do not recognise. A student can be comfortable solving for x in a maths lesson and freeze when the same operation appears as rearranging v = f λ. The skill has not transferred, because nobody has shown them it is the same skill.
The fix: treat calculation questions as a routine, not a puzzle. Write down the equation, substitute the values with units attached, rearrange, then check the answer is a sensible size. Practising that four-step routine on past paper questions builds the transfer that classroom teaching often misses. It also earns method marks even when the final answer is wrong, which is where weaker physics students leave the most marks behind.
A worked example of what this looks like in practice: a Year 10 student we would classify as capable but stuck was scoring around half marks on physics papers while performing well in maths. The diagnosis showed almost all the lost marks were on calculations, and almost all of those were rearrangement and unit errors. One term of drilling the routine on exam questions, with no new content taught at all, moved the calculation marks from the weakest part of the paper to the strongest.
2. Memorising Formulae Instead of Understanding Ideas
The struggle: revision looks productive. The student can recite the equations and the definitions. Then the exam asks a question in an unfamiliar context and the recall is useless.
The cause: physics rewards understanding more than any other GCSE science. Biology allows a student to get a long way on memorisation. Physics does not, because examiners deliberately set questions in contexts the student has never seen: a skydiver instead of a falling ball, a wind turbine instead of a motor. A student who memorised the formula without understanding the idea behind it has nothing to reach for.
The fix: for every equation, the student should be able to answer two questions. What does each quantity actually mean? And what happens to one side if the other changes? A student who can explain why doubling speed quadruples kinetic energy understands the equation. A student who can only recite it does not. Building this habit into revision, explaining ideas aloud rather than re-reading notes, is the single highest-value change most physics students can make.
3. Losing Marks on Technique, Not Knowledge
The struggle: the student knows the content, revises seriously, and still comes out of the exam with a grade that does not reflect either.
The cause: physics papers punish weak exam technique more than most subjects. Command words are precise: describe, explain and evaluate demand different answers, and writing a description when the question says explain scores little. Six-mark extended questions are marked on structured reasoning, not on how much the student writes. And under time pressure, students burn minutes on low-mark questions and leave high-mark calculations unfinished.
The fix: technique is learned through marked practice, not more content revision. The student practises past paper questions against the mark scheme, so they see how marks are actually awarded. They learn to underline the command word before answering. They plan six-mark answers as three or four logical steps rather than a paragraph of everything they know. This is where the fastest grade movement usually comes from, because the knowledge is already in place. The marks were simply being lost on the way to the page.
This is the pattern we see across subjects, and it is central to how we work. Our approach starts with precision diagnosis of exactly where marks are being lost, then targets exam strategy before adding anything new. It is a large part of why 95% of our students improve by at least one grade within their first term.
Not sure which of these is holding your child back?
Our free assessment identifies exactly where the marks are going, whether the gap is maths, understanding or technique, and what a sensible plan looks like.
4. Confidence: The Quiet Multiplier
The struggle: somewhere along the way the student decides "I am just not a physics person", and effort quietly drops to match the belief.
The cause: physics has a reputation as the hard science, and early struggles get interpreted as proof of a fixed limit rather than a fixable gap. Once a student believes the subject is beyond them, they stop attempting the harder questions, which guarantees the results that confirm the belief. It is a loop, and it has nothing to do with ability.
The fix: confidence is rebuilt through visible progress, not encouragement alone. When a student sees their own calculation marks climb over a half term of measured practice, the "not a physics person" story stops surviving contact with the evidence. This is why we track progress explicitly and share it: the student needs to see the improvement, not just be told about it.
A struggling physics student is almost never a weak student. They are usually a capable student with one specific, fixable gap.
Why This Matters Beyond GCSE
Physics has one of the largest jumps from GCSE to A-level of any science, and A-level Physics sits behind some of the most competitive degrees in the country: engineering, physical sciences and a significant share of other STEM courses.
That cuts both ways. A student who ends GCSE with fragile physics foundations and scrapes a grade 6 will find A-level Physics punishing, if their sixth form admits them to it at all. A student who fixes the gaps now, and understands the ideas rather than memorising them, arrives at A-level with the working habits the course actually demands.
For parents of Year 9 and Year 10 students, this is the practical reason not to wait. The problems described above compound. A rearrangement weakness in Year 9 becomes lost calculation marks in Year 10 mocks, which becomes a confidence problem by Year 11. Addressed early, each of them is a small fix.
Final Thoughts
Physics is not the hardest science. It is the science where the gaps are easiest to misdiagnose.
A student losing marks on calculations does not need more content revision. A student memorising formulae does not need more flashcards. A student writing unstructured six-mark answers does not need to work harder. Each needs a different, specific fix, and the first step is always finding out which problem you are actually dealing with.
Students have achieved top GCSE grades with us every year since 2019, and in 2024, 95% of our students achieved grades 7-9 across all four subjects: Maths, Physics, Chemistry and Biology. Behind those results is the same process described in this guide: diagnose precisely, fix the real problem, and let confidence follow the evidence.
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About the Author
A-Star Tuitions Team
The team at A-Star Tuitions specialises in GCSE Maths and Science tuition for students in England. We share practical, evergreen insights to help our readers succeed.
