How to use past papers properly (and why most students don't)
If your child only has time for one kind of maths revision, it should be past papers. Nothing else comes close: hour for hour, it's the single highest-return thing they can do. The catch is that most students treat a past paper as a comfort exercise — done untimed, marked generously by their own hand, glanced at once and never opened again — and then wonder why the grade won't move. Done properly, a past paper is a brutally honest mock and a personalised revision plan rolled into one. Here's the method I drill with my own students, and it works just as well at GCSE as at A-Level.
In this guide
Why past papers beat almost everything else
Reading through notes and highlighting them feels like revision, but it mostly builds recognition: your child sees a worked example, thinks "yes, I know that", and moves on. The trouble is that recognising a solved problem on the page is a completely different skill from producing one on a blank page under pressure. The exam only ever tests the second one.
A past paper is the only form of revision that trains all three of the things the real exam actually measures at once: whether your child knows the content, whether they can decode what a question is really asking, and whether they can do it to time. Exam boards reuse the same question styles year after year, so the more papers your child works through, the fewer nasty surprises are left on the day. There's no shortcut that gets close to it.
Do them to time, with the right board
A past paper done "just to check I can do it" — untimed, with notes nearby, pausing whenever it gets hard — teaches your child almost nothing about sitting the actual exam. The whole point is to recreate exam conditions: a clock running, a phone in another room, no notes, no stopping the timer when a question gets tricky. The first few times feel uncomfortable, and that's exactly the point. Far better to meet that pressure now, in the kitchen, than for the first time in the exam hall.
Just as important: use the right board. AQA, Edexcel and OCR cover the same syllabus but phrase questions differently and weight topics in their own ways, so a paper from the wrong board is decent practice but not the real thing. At GCSE, make sure it's the right tier too — there's no point grinding through Higher papers if your child is sitting Foundation. The papers and the mark schemes are all free to download from each board's own website; you never need to pay a revision site for them. If your child runs out of recent past papers, the boards also publish specimen and practice papers that work just as well.
Mark honestly against the official mark scheme
Here's the part that separates students who improve from students who just keep busy: the marking is where the real learning happens, not the first attempt. Doing the paper only tells you what your child can already do. Marking it honestly tells you precisely what to fix.
So mark against the official mark scheme — the same one the boards publish free alongside every paper — and mark like a real examiner: strictly. A question where your child "basically got there" but slipped on the final answer has still dropped that mark, and it should be counted as dropped. Generous self-marking is the single most common way students quietly fool themselves; the score at the bottom of the page should be the one they'd genuinely get, not the one that makes them feel better. At A-Level there's an extra free resource worth using: the examiner reports, which spell out exactly where students up and down the country lost marks on each question. It's about as close as you'll get to the answers to next year's mistakes.
The rework step almost everyone skips
This is the step that almost no one does, and it's the one that actually moves the grade. Marking a paper tells your child what went wrong. Reworking is what stops it going wrong again. Most students mark a paper, feel a bit deflated about the score, file it away, and reach for a fresh one — so they repeat the same mistakes paper after paper and can't work out why the marks won't climb.
The fix is simple and a bit relentless: every question that dropped a mark gets redone from a completely blank page — no notes, no peeking at the worked solution, as if it were a brand-new question. If your child can do it cleanly, great, that gap is closed. If they can't, then they never really knew it; they only recognised the answer when they saw it. That topic isn't learnt, and it goes straight onto the list.
The one trick I'd keep above all others: a dropped question isn't "done" until your child can rewrite the full solution from blank, with no notes in front of them — and ideally again a few days later. Getting it right immediately after reading the mark scheme proves almost nothing; the solution is still sitting in short-term memory. Getting it right cold, days on, proves they've actually learnt it. Until then it stays on the list and keeps coming back.
Turn mistakes into a weak-topics list
Every question your child has to rework is a signpost pointing at a weak topic. Don't let those signposts go to waste — keep a simple running list of them as you go: trigonometry, simultaneous equations, projectiles, whatever keeps reappearing. After two or three marked papers, that list practically writes your child's revision plan for them, and it's worth far more than any generic checklist, because it's built entirely from their actual mistakes rather than a textbook's idea of what's important.
Then go and work those topics properly, not just by reading them over. The subject-specific guides cover how to do exactly that: how to revise for GCSE Maths, how to revise for A-Level Maths, and how to revise for GCSE Physics if past papers are flagging up the maths buried inside physics. The cycle is the whole game: sit a paper, mark it honestly, rework the misses, shrink the list, repeat.
When to start, and how many to do
Start earlier than feels natural — and crucially, your child does not need to have finished the course first. The common mistake is saving all the past papers for the final fortnight, by which point there's no time left to act on what they reveal. Long before then, your child can do past-paper questions by topic (most boards and revision sites let you filter questions this way) on everything they've already been taught, then move to whole papers under timed conditions in the run-up to build stamina and get used to jumping between topics.
On how many, the honest answer is that the number that matters isn't papers sat, it's papers properly marked and reworked. Five papers done the full way — timed, marked strictly, every miss reworked from blank — will do far more than twenty rushed through and self-marked kindly. As a rough guide:
- GCSE: aim to work through several years' worth of papers for the right board and tier across the final months, doing the full cycle on each rather than racing for a big tally.
- A-Level: lean on topic-filtered questions while your child is still learning each area, then full timed papers nearer the exams. There are fewer past papers around for the newer specifications, so it's worth spacing them out rather than burning through them all early.
How you can help as a parent
This is the part where you can genuinely move the needle, and the best news is that you don't need to do any maths to do it. The official mark scheme has every answer and every mark already written out, so marking a paper against it is a job you can do without remembering a scrap of GCSE algebra.
- Be the timekeeper. Set the clock, take the phone, and keep the conditions honest so the paper actually feels like the real thing.
- Be the marker. Sit with the mark scheme and tick it through line by line — it lifts the boring admin off your child and, more importantly, keeps the marking strict.
- Hold the honest line. Marking generously is the one thing students can't do for themselves, so an outside marker who counts a dropped mark as dropped is worth a surprising amount.
- Watch the weak-topics list. When the same topic keeps landing back on it paper after paper, that's the clear signal to get some focused help on it before it dents your child's confidence.
And if there are topics that keep reappearing on that list no matter how many times your child reworks them, that's usually where a few focused one-to-one sessions make the biggest difference: working through those exact sticking points until they finally make sense is precisely what I do.