Ace
Short answer: the 2357 study method is a simple spaced repetition plan: you learn a topic, then come back to it on a few set days (the version most often shared uses days 2, 3, 5 and 7). Spacing reviews out is one of the best-supported findings in learning research, so the idea works. The numbers themselves are not magic: research suggests the best gap depends on how far away your exam is, and the method only pays off if each review is a test, not a reread.
What is the 2357 study method?
The 2357 method is a revision schedule that went round TikTok under the hashtag #The2357StudyMethod, which Educate Magazine reported at 113.3 million views. You study a topic once, then revisit it on later days rather than in one long sitting. The version you will see most often is: learn it on day 1, then review on days 2, 3, 5 and 7. Some creators run it backwards from the exam date instead, so the last review lands just before the paper.
Speaking to Educate Magazine, a revision expert described it as drawing on spaced repetition and said that planning regular, shorter study sessions "is generally far more effective than doing fewer, very long sessions". That is a fair summary of the research. It is also worth noticing what the method does not say: nothing about what you should actually do when you sit down on day 3.
What the research says about spacing
Spacing is not a TikTok discovery. Cepeda and colleagues (2006) pulled together 839 assessments of spaced versus massed practice from 317 experiments, and found the same broad pattern again and again: spreading study out beats cramming it together, and the gap that works best gets longer as the time until the test gets longer.
The effect holds in realistic study, too. Kornell (2009) had students learn word pairs with flashcards. Spacing beat massing for 90% of participants, yet after the first session 72% of them believed massing had worked better. Cramming feels more effective because the material is fresh in the moment; that feeling fades by the exam.
Are 2, 3, 5 and 7 the right numbers?
For a test about a week away, they are reasonable. For a final exam two months away, they are probably too tight.
The clearest data comes from Cepeda and colleagues (2008), who taught more than 1,350 people a set of facts, gave them one review after a gap of up to three and a half months, and tested them up to a year later. The best gap rose as the test got further away. As a share of the time until the test, the ideal gap was roughly 20–40% for a test one week later, falling to roughly 5–10% for a test one year later.
In practice that means:
- Test in about a week: reviews one to three days apart, which is what 2357 gives you.
- Exam in a month or more: keep the early reviews close, then stretch the later ones to a week or more apart. Our spaced repetition schedule shows one way to set the gaps.
- Exam tomorrow: no schedule saves you, but a short test-yourself session still beats rereading.
So treat 2357 as a starting template, not a rule. The principle (come back to it, and come back less often as it sticks) matters more than the exact digits.
What to do in each review session
A spaced schedule full of rereading is still rereading. The bigger win comes from making each review a test. Roediger and Karpicke (2006) found that students who practised recalling a passage remembered substantially more of it two days and one week later than students who reread it, even though rereading looked better on a test five minutes later and made students feel more confident.
A good 2357 session is short and closed-book:
- Day 1: learn the topic properly from your own notes or slides. End with a five-minute blurt: close everything and write what you remember.
- Day 2: answer practice questions on it before you look at your notes. Mark what you missed.
- Day 3: questions again, starting with yesterday's misses.
- Day 5: mix this topic with another one, so you have to work out which idea a question needs.
- Day 7: a timed set in exam style. Anything you still miss goes into next week's plan.
Each review should take fifteen to thirty minutes, not an hour. The point is frequency, not length.
A 2357 plan you can start this week
The hard part of 2357 is bookkeeping. With five subjects, each started on a different day, you quickly have several topics due at once. Two habits keep it manageable:
- Start one new topic a day, at most. By day 7 you are reviewing four older topics and learning one new one, which is plenty.
- Write the review days in your calendar when you learn the topic. Decide on day 1, not on the day. Our guide to making a revision timetable covers the rest of the plan.
You also need questions to answer on days 2 to 7. You can write them yourself, use past papers, or use a tool. Ace turns your own PDFs, slides and lecture videos into practice questions, checks every answer against your file, and keeps a streak and study calendar, which makes the "come back on day 5" part easier to keep.
Frequently asked questions
Is the 2357 method backed by science?
The idea behind it, spaced practice, is one of the best-supported findings in learning research. The specific days 2, 3, 5 and 7 have not been tested as a package; they are a sensible spacing for a test about a week away.
What do I do on each day of the 2357 method?
Test yourself on the topic before looking at your notes, then check and fix what you missed. Rereading on each day gives you much less of the benefit.
Does 2357 work for exams that are months away?
Use it for the first week, then keep reviewing with longer gaps. Research suggests the best gap grows as the exam gets further away.
Can I combine 2357 with blurting?
Yes. Blurting is a good way to do the day 1 and day 7 sessions, because it makes you recall the whole topic from memory before checking.
Sources
- Educate Magazine (2024). Are viral TikTok revision hacks any good?
- Cepeda, N. J., Pashler, H., Vul, E., Wixted, J. T., & Rohrer, D. (2006). Distributed practice in verbal recall tasks: A review and quantitative synthesis. Psychological Bulletin, 132(3), 354–380.
- Cepeda, N. J., Vul, E., Rohrer, D., Wixted, J. T., & Pashler, H. (2008). Spacing effects in learning: A temporal ridgeline of optimal retention. Psychological Science, 19(11), 1095–1102.
- Kornell, N. (2009). Optimising learning using flashcards: Spacing is more effective than cramming. Applied Cognitive Psychology, 23(9), 1297–1317.
- Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255.
