Best Revision Methods, Ranked by the Evidence

The best revision methods are retrieval practice and spaced practice, the only two of 10 techniques Dunlosky and colleagues rated high utility in their 2013 review for Psychological Science in the Public Interest. Students who tested themselves recalled 61% of a passage a week later; students who re-read it recalled 40%, having read it 14.2 times against the tested group's 3.4. Re-reading and highlighting were both rated low utility.

Which revision techniques does the research actually rank highest?

Five psychologists — John Dunlosky, Katherine Rawson, Elizabeth Marsh, Mitchell Nathan and Daniel Willingham — read the experimental literature on 10 study techniques and graded each one for utility: how reliably it works across different ages, abilities, materials and types of exam. Their verdict is the closest thing the field has to a league table, and it is the table almost every revision article alludes to without printing.

The wording of the top tier matters, because it is a claim about generality rather than raw size. Practice testing and distributed practice, the authors write, “received high utility assessments because they benefit learners of different ages and abilities and have been shown to boost students' performance across many criterion tasks and even in educational contexts”. The middle tier is not a criticism of the techniques so much as of the evidence behind them: elaborative interrogation, self-explanation and interleaved practice “fell short of a high utility assessment because the evidence for their efficacy is limited”.

The bottom tier is where most students live. The authors are blunt about it: “Five techniques received a low utility assessment: summarization, highlighting, the keyword mnemonic, imagery use for text learning, and rereading.” Two of those five — highlighting and rereading — are the two techniques the authors say most students report: “Most students report rereading and highlighting, yet these techniques do not consistently boost students' performance, so other techniques should be used in their place (e.g., practice testing instead of rereading).”

Why does re-reading feel like it is working?

Because over a short enough horizon it does work, and that is a measured result rather than a rhetorical concession. Henry Roediger and Jeffrey Karpicke gave students prose passages and then either let them study again or made them take a free-recall test. When the final test came 5 minutes later, the re-studying group won: 81% against 75%. The second experiment sharpened the point. Students who studied four times scored 83%, students who studied three times and tested once scored 78%, and students who studied once and tested three times scored 71%. On that timescale, scores rose with the number of study periods.

Students also know it. In the same experiment the group that only re-read was the most confident of the three: they “were more confident that they would remember the passage in 1 week than were subjects in the SSST or STTT condition”. They were also the group that remembered the least. Confidence and retention pointed in opposite directions, which is why the method survives every attempt to argue students out of it.

The survey evidence says the argument has not been won. Karpicke, Butler and Roediger asked 177 undergraduates to list what they actually do when they study. Re-reading was “by far the most frequently listed strategy with 84% of students reporting it”, and 55% named it their single most-used method. Retrieval practice was named by 11% of them, and by 1% as their first choice. Flashcards were reported by 40% and practice problems by 43%, and the authors note that even counting both as self-testing, “these percentages are dwarfed by the 84% of students who repeatedly read while studying”.

How much does testing yourself add after a week?

Roediger and Karpicke ran the same comparison at three delays, and the ordering flips somewhere between five minutes and two days. This is the single most useful table on the page, because the interval that matters to a candidate is the one between revising a topic and sitting the paper — never five minutes.

One consequence is worth stating in its own sentence. The tested group's score after a week matched the re-studying group's score after two days: taking a single recall test “prevented forgetting of information for an additional 5 days relative to repeated study”. One test, five days of forgetting bought back.

The second experiment is the one to quote at a student who insists more reading is more learning, because it counts the readings. Everyone had four periods with the passage; what differed was whether each period was spent reading it or recalling it.

The group that read the passage a quarter as often remembered half again as much. As the authors put it, the repeated-testing group “recalled much more after a week than did students in the repeated-study condition (61% vs. 40%), even though students in the former condition read the passage only 3.4 times and those in the latter condition read it 14.2 times”. That is the whole case for closing the book, and it is worth more than any amount of advice about study atmosphere. Marked past-paper work under timed conditions is the practical version, and it is the format of our GCSE tuition sessions: the student produces the answer first and the mark scheme comes after.

How many days should the gap between revision sessions be?

Every revision article says to space it out. Almost none says how far, which makes the advice unusable. Nicholas Cepeda, Edward Vul, Doug Rohrer, John Wixted and Harold Pashler answered it directly: they taught 1354 people a set of facts, brought them back for a review after a gap of anywhere up to three and a half months, then tested them at delays of up to a year after that review. The gap that produced the best final score was not the shortest and not the longest, and it moved with the delay.

Read the third row again. For a test 70 days after the second sitting, revising a topic twice with three weeks between the sittings produced more than twice the recall of revising it twice on the same day — same material, same total minutes, different calendar. The authors summarise the pattern as an optimum gap of “about 20% of the test delay for delays of a few weeks, falling to about 5% when delay was one year”, and they are candid about the implication: “The interaction of gap and test delay implies that many educational practices are likely to be highly inefficient.” Across the study the best gap produced a 64% increase in final recall against no gap at all.

There is a caution buried in the top row. When the test comes only a week after the second sitting, the best available gap was a single day and it bought 10%. Spacing is a technique for the student who starts early; it has very little to give the student who starts in the final week. That is the honest reason to build a schedule in the autumn rather than the spring, and it is the arithmetic behind our advice on how long GCSE revision actually takes.

How do you use these revision methods in the weeks before GCSE mocks?

Work backwards from the date of the paper, and start by finding when mocks begin at your school, because it differs from school to school. Three schools' own published calendars give three different dates for the start of the first Year 11 mock window: Warden Park Secondary Academy in Haywards Heath, 10 November 2026; St Gregory's Catholic College in Bath, 23 November 2026; Yardleys School in Birmingham, 7 December 2026. Our guide to when GCSE mocks actually happen sets out more dates school by school.

Then read the gap off the spacing table above, remembering that its days run from the second sitting to the test. Take a paper on the first day of mocks starting Monday 7 December 2026, the Yardleys date: a second sitting 35 days before it (Monday 2 November) is best preceded by a first sitting 11 days earlier (Thursday 22 October), and a second sitting 7 days before it (Monday 30 November) by a first sitting 1 day earlier (Sunday 29 November).

The 7-day row is the smallest payoff the study measured (10%, against 59% at 35 days), so a topic revised in the last week is better tested than re-read: Roediger and Karpicke found re-studying ahead only when the final test came 5 minutes later, with testing ahead after 2 days and after 1 week. Make each session before the paper a mock in miniature: a few past-paper questions with the notes shut, marked against the mark scheme.

A mock is itself a closed-book paper, so its marked script shows which topics hold. The next distance to plan is the summer series, scheduled to start on Thursday 6 May 2027 according to BBC Bitesize, which relays the exam boards' dates and says they might change. That is 150 days after mocks starting on 7 December 2026. Cepeda and colleagues tested intervals of 70 and 350 days between the second sitting and the test, not 150, and the best gap was 21 days at both, so re-studying the topics a mock exposes about three weeks after the mock is a sensible starting point; that is an inference from the two ends, not a measurement at 150 days. GCSE tuition after mocks builds a programme around a student's actual mock paper and its marked topic list.

Does mixing topics beat working through one at a time?

Interleaving is the technique students abandon fastest, because a mixed problem set feels worse to do than a blocked one. Doug Rohrer, Robert Dedrick and Sandra Stershic tested it where it counts: 126 seventh-grade students in a Florida middle school, over a 3-month period, taught by their own teachers, with graph and slope problems either blocked by type or shuffled together. Every student got the same problems. Only the order changed. The test was unannounced.

The lead holds over the delay rather than closing, which is the reverse of what most study tricks do. Split by problem type at the 30-day test, interleaving produced 84% against 54% on graph problems and 65% against 29% on slope problems. The authors also note that the interleaved group barely forgot anything: “the 30-fold increase in test delay reduced test scores by less than a tenth (from 80% to 74%)”.

The practical translation for a maths or science student is small and specific. A revision set of 20 questions on one topic teaches the method; it does not teach recognising which method a question wants, because that has already been given away by the heading on the worksheet. Mixing three topics into one set puts that decision back. Mixed sets built from past papers are the practical version, and the format to ask for in maths tutoring and A-level tuition.

Where does this evidence stop?

It is worth being straight about the limits, because the confident tone of most revision writing is not supported by the literature it borrows from. The Education Endowment Foundation, the body that funds and reviews classroom trials in England, published a review of cognitive science approaches in the classroom in July 2021, restricted to studies run in real schools. Its conclusion is more cautious than any of the individual experiments above: “Even approaches with indicative evidence of promise like retrieval practice, spaced practice, and the use of worked examples are, as yet, only supported by a few studies that examine their impact in everyday classroom conditions—delivered by teachers over long periods of time.”

On interleaving it goes further: “there are studies with promising results but they have almost exclusively been tested in one subject area (mathematics)”, and “there are serious gaps and limitations in the age ranges, subjects, and learning outcomes studied for most of the strategies we reviewed”. That is worth holding next to the Florida study, which was itself a maths study. Rohrer and colleagues say the same thing from the other direction: their classroom effects were “much smaller than interleaving effects observed in the laboratory”.

None of that overturns the ranking. It changes how firmly it should be stated. Retrieval and spacing are the safest bets a student can make with their time, tested repeatedly and in more than one setting. Interleaving is well evidenced in maths and thinly evidenced elsewhere. Anyone who tells a family that a technique will deliver a specific grade uplift is going beyond what has been measured.

What a revision week looks like if you follow the numbers

The findings above convert into four decisions, and none of them is about stationery or study playlists.

Set the gap from the exam date, not from habit. Counting from the second sitting to the paper, the measured best interval between two sittings of the same topic was 11 days when the paper was 35 days later and 21 days at 70 days. A topic covered in the first week of a half term and revisited three weeks later has done more work than the same topic covered twice in one afternoon, and it has cost the same number of minutes.

Make the first pass a retrieval pass. Close the book and write what you can before opening it. The 61% against 40% comparison held even though the tested group had read the material a quarter as often, so a retrieval-first session is not a weaker route to the same place.

Mix the set. For quantitative subjects, build practice sets that draw from three or four topics at once. Expect it to feel harder and score lower during practice; the 74% against 42% result appeared 30 days later, not on the day.

Stop marking your own confidence. The students most sure they would remember were the ones who remembered least. The only reliable check is a closed-book attempt marked against a mark scheme, which is also why a mock is worth more than an evening of notes. Families preparing for the final year often find the sequencing in our Year 11 revision guide and the subject-specific plan in our GCSE Biology revision guide easier to act on than a general timetable.

The techniques rated low utility are not forbidden. Highlighting a specification to plan the week is fine; it is only a problem when it is mistaken for the revision itself. The distinction the evidence draws is between arranging material and retrieving it, and only the second one is learning. A ten-year-old cannot run any of this alone, which is why our guide to helping a Year 5 or Year 6 child revise for the 11+ deals with the parent's half of the job: session lengths a child of that age can sustain, a weekly timetable they have agreed to, and keeping your own exam anxiety out of the room.

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