14 October 2026 · Hugo Harrabin
In most schools Ofsted visited, the GCSE maths tier was settled at the end of Year 9. What a Year 9 set means, which kind of behind it is, and what to ask.
A Year 9 report comes home, or a parents' evening appointment ends with "she's a bit behind", or your child mentions they've been moved to a different maths set. GCSEs still feel two years away, so it's easy to file it under things to worry about later.
In maths, the decisions that shape GCSE often come sooner. This guide explains how a Year 9 maths set can decide which GCSE grades your child is able to get, and what to do while there's still time to catch up.
Key Takeaways
- In most of the schools Ofsted visited for its 2023 maths report, the GCSE maths tier was settled at the end of Year 9.
- How a child is doing in Year 9 can decide whether they sit Foundation maths, the easier paper, where the best possible grade is a 5, or Higher maths, which goes up to a 9. A 6 or above is the grade many sixth forms ask for to study A-Level Maths, so the tier can shape A-Level and degree options too.
- The tier usually follows the maths set. Pupils can move sets, but few schools have a plan to fill the gaps a child has after moving up.
- "Behind" covers different problems: a gap from earlier years, forgetting, knowing a method without seeing when to use it, and a confident misunderstanding. Each needs a different fix, so find out which one it is first.
- In our Year 9 entry diagnostic this autumn, half the students could solve an equation once it was written out for them, but couldn't set one up from a word problem.
In most of the schools in Ofsted's 2023 maths report, the GCSE tier was decided in practice at the end of Year 9, and that decided what pupils were taught in Years 10 and 11. The formal exam entry comes later, in Year 11, but by then most of the course has been taught.
GCSE maths has two tiers, and each child sits one:
So the tier decides the highest grade your child can get. A child who needs a 6 or above, for example to study A-Level Maths, has to sit Higher. Our Foundation or Higher tier guide explains the risks of each.
Year 9 is the last year of Key Stage 3, and maths is compulsory at GCSE. Some schools start the GCSE course in Year 9, so ask yours when maths starts.
In most schools, the tier follows the set. Almost all the schools Ofsted visited put pupils into maths sets by attainment. Ofqual, the exams regulator, found that tier decisions mostly followed those sets: top sets for Higher, the lowest for Foundation, and a discussion about the middle (Ofqual, 2017).
The middle sets are where it's hardest. Ofsted found that pupils on the border between the tiers were often held back in Foundation classes or rushed through Higher ones, and that lower sets got less teaching on problem solving. So a set shapes what a child learns, as well as which paper they sit.
Pupils can change sets, and most schools allow moves during the year. But moving up gets harder the longer it's left. A lower set usually works through the course more slowly, so every term it falls further behind the set above, and the gap in what the two groups have been taught grows. A child who moves up joins a class that has covered work they haven't, and few schools have a plan for filling that gap. The earlier the move, the less there is to catch up, so if you think your child belongs in a higher set, raise it early in Year 9 and ask what support comes with the move.
They're different things. A set shows where a child was when the set was decided. It doesn't set a limit on what they can do, and in Year 9 it can still change.
A child in a lower set who is ready for more needs the school to see it before the end of the year. A child in the right set who is struggling within it needs the gaps found and closed, and moving them won't do that on its own. How sets are first decided, and how often they turn out to be wrong, is covered in our guide to Year 7 maths.
Be careful with grades on Year 9 reports. Some schools put a GCSE grade on Year 9 tests ("working at a 5"), and Ofsted warned that this gives false reassurance about what pupils have learned (Ofsted, 2023). A Year 9 test covers far less than a GCSE paper. Ask which topics your child got wrong instead: that tells you what to work on, and a grade doesn't.
Find out which kind of behind your child has before deciding what to do. From the outside they look alike: low marks, a worried comment from a teacher. Each has a different first step.
| Kind of behind | What you might see | First step |
|---|---|---|
| A gap from earlier years | The same kind of question goes wrong every time, such as anything with fractions | Find the topic and teach it again from where it broke |
| Forgetting | Could do it last year, can't now, picks it up quickly after a reminder | Short practice on that topic, spread over a few weeks |
| Knows the method, can't see when to use it | Homework is right, tests go wrong, especially word problems | Mixed practice where the question doesn't say which method to use |
| Sure and wrong | Answers quickly and confidently, and gets the same kind of question wrong | Teach the idea again; practising more of the same won't correct it |
Our teachers' rule of thumb. A child can have more than one.
Whichever it is, the first job is to find out exactly which topics are missing, which is what the Education Endowment Foundation's guidance says school assessment should show (EEF, 2017). For forgetting, our guide to why your child remembers nothing from their revision explains what helps. The last two kinds showed up clearly in our own data this autumn.
Every child who starts with us sits a short diagnostic, where each wrong answer points to a particular misunderstanding. The first Year 9 students to sit it this autumn were a mix: some were behind, and some were doing well and their parents wanted to keep them ahead. Two patterns stood out.
Half could solve an equation, but couldn't set one up. Nearly all of them could solve an equation that was already written out, such as 3x + 5 = 20. Far fewer could start from words. Take "Sam is 4 years older than Ana, and their ages add up to 30. How old is Ana?" Before any solving, a child has to turn the sentence into x + (x + 4) = 30. Half the students could do the algebra once it was written down for them, but couldn't write it themselves. It's the gap we describe in why a child can do the drill but not the exam question, and it's why a child can do well on homework and still drop marks in tests.
A fast answer can be a confident mistake. One question asked for the overall effect of a percentage rise followed by a smaller percentage fall. About 40% chose the answer you get by working out both percentages from the original price, and most of them answered in 16 seconds or less. A quick answer that matches a known mistake points to something the student believes.
You can check for this one at home. Ask: "A price goes up by 20%, then down by 20%. Is it back where it started?" A child with this misunderstanding will say yes. Start with £100. 20% is £20. If we add 20%, we've now got £120. But 20% of £120 is £24. If we take 20% from £120, we're left with £96. If your child said yes quickly, more practice of the same kind won't fix it. Someone needs to teach them that a percentage change multiplies the amount (by 1.2 for a 20% rise, by 0.8 for a 20% fall) rather than adding or taking away a fixed amount.
Dates vary by school. If your child's school holds a GCSE options evening this year, maths can get lost in it, because every pupil takes it. If you're worried now, email the maths teacher rather than waiting.
Appointments are short, so take a short list:
Teachers see far more of your child's maths than any one test shows, so their reasons are worth hearing in full. For the questions to ask later, when the school makes the exam entry in Year 10 or 11, see our Foundation or Higher tier guide.
Use Year 9 to find the gaps and close them before GCSE content builds on them. Start with the school: if the problem is the set, the teacher is the one who can change it. At home, keep practice short, spread it over a few weeks and stick to the topics the teacher names; our guide to revision that works explains why. Our guide to helping when you don't know the curriculum shows how to do that without knowing the maths yourself.
Extra help isn't always the answer. If the diagnostic shows one narrow gap, a few targeted sessions may be enough. If your child is in the right set and keeping up, they may need nothing more than the school is giving them. Where outside help is needed, it works best when it starts from what the school and a diagnostic say is missing: several schools told Ofsted that outside tutors had had limited success, and that tutors did better when they knew the school's maths curriculum (Ofsted, 2023). Our guide to the signs a child needs a tutor covers that decision, and group tutoring vs one-to-one covers what the evidence says about the format.
Our free first lesson includes the diagnostic assessment described above, which shows which topics your child is missing and which they're sure about but getting wrong. Your child then joins a weekly class of six to eight students at the right level. It's taught by a PGCE-qualified maths teacher and works through those gaps alongside what they're learning at school. You get a progress report every half term.
Yes. In most schools Ofsted visited for its 2023 maths report, the GCSE tier was settled at the end of Year 9, and the tier decides the highest grade a child can get (Ofsted, 2023). Ask your child's school when it decides.
Not always. The formal entry isn't made until Year 11, but later moves are uncommon and usually go down, from Higher to Foundation (Ofqual, 2017).
Usually, yes. Most schools let pupils move between sets during the year. Ask what your child would need to show, when sets are next reviewed, and what support comes with a move up.
No. Years 10 and 11 are still to come, and Year 9 is a good time to close gaps before GCSE content builds on them. Start by finding out which topics are missing, then work on those first.
Some do. In one survey, about two-thirds of schools started GCSE courses in Year 9 for at least some subjects (NFER, 2022). Ask your child's school when its GCSE maths course starts.
Sit in on a lesson led by one of our expert PGCE qualified teachers.
Book your free lessonThe guides are a great place to start. Each one covers a topic end to end and links to the articles that go deeper.
Grades, tiers, the three papers, where examiners say marks are lost and what a grade 3 means for sixth form.
The revision methods with the best evidence, how to use them to plan a week and how you can help at home.
Whether your child needs a tutor, what it costs, group or one-to-one and the nine questions to ask before you book.
