3 October 2026 · Hugo Harrabin
The GCSE revision methods with the best evidence, the popular ones that fail, and a week that combines testing from memory, spacing and mixing topics.
Picture two evenings of GCSE revision. In the first, your child sits at the desk for two hours with their notes open, highlighting as they go, and comes down for dinner feeling on top of it. In the second, they spend forty minutes answering questions from memory, get a third of them wrong, and come down feeling worse than when they started.
The second evening did far more. From the kitchen the two look much the same: a closed door and a child who was "revising". This page is about telling them apart, and about which three habits the second evening is built from.
Key Takeaways
- Most students revise by re-reading and highlighting. In one survey of US university students, 84% re-read their notes and 1% named testing themselves as their main strategy. Re-reading is one of the weakest methods there is.
- Three techniques do most of the work: testing from memory (how to revise), spacing (when to revise) and mixing topics (what goes into each session). The first two had the strongest evidence of the ten techniques in the best-known review.
- All three feel worse than re-reading while your child is doing them. Students judge revision by that feeling, and they judge it wrongly.
- There's no reliable research on the right number of hours. There is good research showing that how the hours are spread matters more than how many there are.
- In practice, a good week is a short daily recall slot, one main subject block each evening with older topics mixed in, and one timed paper at the weekend.
Most GCSE students revise by reading their notes again, highlighting them, and copying them out more neatly. These feel productive, because the material looks more familiar each time. But being familiar with something isn't the same as being able to produce it on a blank exam paper, and that gap is where most revision time is lost.
The habit is close to universal. Karpicke, Butler and Roediger (2009) asked 177 university students to list the strategies they used to study. Re-reading came top by a distance.
And when they were asked which one strategy they relied on most, 55% said re-reading and just 1% said testing themselves from memory.
The popularity is the problem, because re-reading is one of the weakest techniques there is. In the most cited review of study methods, Dunlosky and colleagues (2013) rated ten techniques. Re-reading and highlighting were both rated low value, and only two were rated high. We go through why re-reading fails in its own post.
One more popular idea is worth dropping: learning styles. You'll still find revision guides telling students to work out whether they're "visual" or "kinaesthetic" learners and revise to match. A review by Pashler, McDaniel, Rohrer and Bjork (2008) found no adequate evidence that matching teaching to a learning style improves results. An evening spent turning notes into a colourful mind map because your child is a "visual learner" is still an evening of re-reading unless done from memory.
Good revision comes down to three changes, and each one answers a different question. Testing from memory decides how your child revises. Spacing decides when. Mixing topics decides what goes into each session. They don't compete with each other, and the best revision uses all three at once.
| Technique | The question it answers | What it replaces | The full explanation |
|---|---|---|---|
| Testing from memory | How should they revise? | Re-reading, highlighting, copying notes | Why testing beats re-reading |
| Spacing | When should they revise each topic? | Cramming a topic just before its test | What spaced repetition is |
| Mixing topics (interleaving) | What should go into one session? | Practising 50 trigonometry questions in a row | The science of interleaving |
Testing from memory means working with the notes closed. Write down everything you can remember about a topic, answer flashcards before turning them over, or do past-paper questions without the textbook open, then check. It was one of the two techniques Dunlosky's review rated high.
Spacing means coming back to a topic several times, with longer gaps each time, instead of revising it once in a big block. A topic taught in October should be looked at again in November, in January and in the spring, not left until the Easter holidays. It was the other technique rated high, and the timing is what makes it work.
Mixing topics means a session that jumps between, say, algebra, probability and trigonometry, instead of twenty algebra questions in a row. Dunlosky's review rated it moderate, a step below the other two, but the classroom evidence since has been strong. In a classroom study of maths students, practising the same problems in mixed order put students 16 points ahead after a day and 32 points ahead after a month.
The three combine without any extra work. A set of past-paper questions, drawn from topics taught weeks ago, answered without notes and in mixed order, uses all three techniques at once. That one kind of session makes up most of the week further down this page.
All three techniques feel worse than re-reading while your child is doing them. Students judge revision by how it feels, so they tend to drop the methods that work. This is where a parent can help most, because you can judge the results rather than the feeling.
The clearest evidence for this comes from Kornell and Bjork (2008). University students learned to recognise the styles of different painters, studying some artists' paintings in a block and others mixed in with other artists. Mixing produced better results for most of them. Then, after taking the test, the students were asked which method had helped them more.
Nearly four in five did better with mixing, and nearly four in five said blocking had been as good or better. They had just taken the test, and they still trusted the feeling. Your child is very unlikely to be a better judge than they were.
Bjork and Bjork (2011) call techniques like these desirable difficulties: they make revision harder while your child is doing it and leave more behind for the exam. Testing, spacing and mixing are all examples.
So when your child says flashcards are pointless and they were "getting on fine" with their notes, don't take it as a verdict on the method. Judge the revision by one thing instead: what they can do with no notes, a week later. A child who can write out a topic from memory on Sunday that they revised on Monday is revising well, however bad Monday felt. A child who can't is revising badly, however calm the evening looked. You can check that without knowing any of the content. Ask them to explain the topic to you, or look at the questions they got wrong. And tell your child up front that the better method will feel worse, so the first bad evening doesn't end it.
No good study tells you how many hours a GCSE student should revise, and the honest answer is that it depends on the child: their current grades, the grades they're aiming for, the size of the gaps in between, and how quickly they pick things up. A student two grades short in maths needs more time than one already comfortably above their target. Measuring that gap is the place to start, and our guide to using a timed past paper and the grade boundaries shows how to do it for maths. The "one to four hours a day" you'll see in revision guides is an estimate, not a research finding. What the research does show is that the spread matters more than the total. The same hours do more when each topic is revisited across weeks than when they're packed into the run-up to the exam.
The most useful study on this is Cepeda, Vul, Rohrer, Wixted and Pashler (2008). It taught more than 1,350 adults a set of facts, reviewed them after gaps of up to three and a half months, and tested them up to a year later. The best gap before coming back to the material depended on how far away the test was. For a test a week away, it was about 20 to 40% of that week. For a test a year away, it fell to about 5 to 10% of the year.
Our reading of that, as a rule of thumb rather than a finding (the study tested a single review, not a whole schedule):
A topic your child revised properly in September still needs a return visit in October. It doesn't need one every night.
On the hours themselves, our working figures are a judgement based on how long students can keep up good-quality testing, not a research result:
| Stage | School nights (Sunday to Thursday) | Saturday |
|---|---|---|
| Year 10 | 30 to 45 minutes, most nights | About an hour |
| Year 11, autumn term | About an hour | 1.5 to 2 hours |
| Year 11, spring term to exams | 1.5 to 2 hours | 2 to 3 hours, with breaks |
As a working rule, shorter sessions with breaks hold up better than long unbroken ones, and an hour of questions answered without notes is likely to do more than several hours of re-reading. If your child is doing a lot of hours and still struggling, look at the method before the amount. Adding hours of the wrong kind of revision won't fix it. For students resitting maths after Year 11, the shape is similar but the timetable is tighter, and the eleven-week resit plan sets it out week by week.
A good week has a short recall slot every day on older material, a main block each evening on one subject using questions rather than notes, and the main subjects coming round two or three times a week rather than once. At the weekend there's one timed exam section, marked honestly. Here's that week for a Year 11 student in the autumn term. It comes to about an hour on school nights (a 15-minute spaced retrieval cold start plus a 40 to 45 minute main block), 1.5 to 2 hours on Saturday, and Friday off:
| Day | Spaced retrieval, no notes | Main block |
|---|---|---|
| Monday | Science key terms and equations from last month, answered before checking | Maths: past-paper questions across three topics, marked |
| Tuesday | Five maths questions on topics from last month, mixed | Science: exam questions from two different units, mixed |
| Wednesday | Write out everything you remember about a history topic from Year 10, then check | English Literature: plan two essay answers on two different texts |
| Thursday | English Language: plan a writing answer in five minutes, from memory of the question types | History: two exam questions, marked against the mark scheme |
| Friday | Off | Off |
| Saturday | English Literature quotations from memory, across both texts | One timed exam section in the weakest subject, about an hour, then marked against the mark scheme |
| Sunday | Redo every question got wrong this week, cold | English Language: one reading question and a plan for one writing question, then French vocabulary flashcards, shuffled |
Three rules make it work, one for each technique:
The free evening is deliberate. A timetable with no slack is easy to drop by half-term. It's better for your child to keep going at an hour a night all term than to manage two hours a night for a fortnight.
Fold homework in, don't stack revision on top of it. If the school sets a lot of homework, the week above sits on top of it, and it won't last. Homework that has your child answering questions without their notes is already doing the main block's job, so let it replace that evening's block. Keep the fifteen minutes of spaced retrieval either way. Homework is usually on the topic being taught now, so it rarely brings back the older ones.
Many schools already start lessons with quick quizzes on older topics. That helps, but it follows the class's scheme of work rather than your child's gaps, so it doesn't replace your child's own spaced retrieval.
Share the time out by the gap, not evenly. The week above gives each subject roughly the same time, and your child's real week shouldn't. Start from the gap between their current grade and the grade they need in each subject. A weak subject where they need a better grade gets more main blocks. A strong subject gets fewer, and can mostly be kept topped up through the short retrieval slots. Count separate GCSEs separately too: a student taking triple science is sitting three science exams, and one science block a week won't cover biology, chemistry and physics.
Put the hardest subject where the most energy is. A weekday main block comes after a full day at school, and often after a club or practice as well. Saturday and Sunday blocks get your child at their freshest. Give the weekend slots to the subject with the biggest gap, and keep the weekday evenings for shorter, more familiar work.
Adapting the week. Swap history for geography, or alternate them week to week, depending on what your child takes. From the Easter holidays of Year 11, the main blocks change: they become full past papers under timed conditions, marked against the mark scheme, then time spent on the weaker topics those papers show up. The daily mixed retrieval carries on as before. And if your child has done almost no revision so far, don't start with this week. Start with only the spaced retrieval for a fortnight: fifteen minutes a day, from memory. That habit is the hardest part to build, and everything else fits around it.
For subjects where your child has never properly understood a topic, no schedule will fix that. Mixing and testing strengthen material that has been taught and understood. If a topic was lost in class, it needs teaching again first. This is especially common in maths, where each topic builds on the one before.
Often the problem isn't which method your child uses. The revision isn't starting at all. No timetable fixes a child who won't sit down, and pushing a better method on a child who isn't revising in the first place usually starts an argument.
You don't need to know the content to help with that part. What makes a difference is routine, where revision happens, and the kind of questions you ask. We've set that out in how to help your child with GCSEs when you don't know the curriculum. Start there before you start on any schedule.
The three techniques are also hard to keep up alone, because each one feels worse than the method it replaces. That's the reason Tugo sessions are built around them. You can see how testing, spacing and mixing are built into each session if that's useful. Everything on this page works at home too.
Test yourself from memory rather than re-reading, come back to each topic several times over weeks rather than once, and mix topics within a session. Testing and spacing were the only two techniques rated high value, out of the ten in Dunlosky and colleagues' 2013 review. In practice, past-paper questions from older topics, done in mixed order without notes and then marked, use all three at once. We go through the evidence for each in why testing beats re-reading, how spaced repetition works and why mixing topics works.
There's no research-backed number, because it depends on your child: their current grades, their target grades, how big the gaps are and how quickly they learn. As a working guide, about an hour on school nights in the autumn of Year 11, rising to 1.5 to 2 hours in the spring term. Research does show that spreading revision matters more than the total: Cepeda and colleagues (2008) found the best gap between reviews grows the further away the exam is. The evidence shows that, for the same time spent, answering questions without notes beats re-reading, so an hour of it is likely to do more than several hours of re-reading.
In the term each topic is taught, with short reviews of older topics from Year 10 onwards, and properly from September of Year 11. Starting early doesn't mean more total work, because the reviews can be further apart when the exam is further away. Spaced review explains the timing.
No. Pashler and colleagues (2008) reviewed the evidence and found no adequate support for matching study methods to a "visual", "auditory" or "kinaesthetic" style. The techniques that do work, testing, spacing and mixing, work whatever style a student thinks they have.
If you only read one of the three technique posts, make it why testing beats re-reading. It's the change that makes the most difference, and the one your child can start tonight.
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