Volume feels reassuring, but revision time before GCSEs is genuinely scarce. Targeted practice on real gaps tends to beat working through everything equally.
25 August 2026 · 4 min read
There's a natural instinct, especially as exams approach, to measure revision by volume — the number of past paper questions completed, the number of topics covered, the thickness of the completed workbook. It's an understandable instinct, because volume is easy to see and easy to feel good about. It's also not a reliable measure of whether revision time is actually being well spent.
Imagine two students each complete 200 practice questions before their exam. One works through them in the order they appear in a revision guide, getting most of the number and ratio questions right (because they were already secure there) and struggling through the same handful of algebra and geometry questions they've always struggled with, without ever pausing to work out why. The other spends the same 200 questions almost entirely on the topics they've identified as genuinely weak, reviewing each mistake before moving on. Both did "200 questions." Only one of them meaningfully improved.
Working through more questions on a topic that's already secure mostly just confirms what was already known. Working through more questions on a topic where the underlying method isn't understood, without stopping to fix that misunderstanding, mostly just repeats the same error at a slightly higher volume. Neither produces the kind of improvement that shows up as extra marks in the real exam.
GCSE revision happens inside a genuinely fixed window, and every hour spent on a topic that's already secure is an hour not spent on one that isn't. This is really the same point made in why more maths practice isn't always the answer, but it matters even more at GCSE, where the revision period is shorter relative to the amount of content, and the stakes of the final exam are higher.
Rather than working through a revision guide cover to cover, identifying weak topic strands first — as covered in GCSE maths: how to identify your weak topics — and then concentrating practice there produces more improvement per hour spent. It feels less thorough in the moment, because it deliberately skips over content that's already secure, but it's a far more efficient use of a genuinely limited amount of time.
Even targeted practice loses most of its value if a wrong answer just gets marked and moved past without understanding why it was wrong. The review step — working out what went wrong and fixing the specific misunderstanding — is where the actual learning happens, not in the act of attempting the question itself.
Grasp Maths directs practice towards genuinely weak topics rather than working through everything in sequence, and makes sure every wrong answer gets properly reviewed — so a limited revision window gets spent on what will actually move the needle, not just on volume.
Try a free Grasp Maths practice session and see revision targeted at genuine gaps, not volume for its own sake.