Active recall and spaced repetition: a step-by-step setup

Active recall means testing yourself by pulling answers out of your memory instead of rereading. Spaced repetition means doing those tests again at growing gaps (a day, a few days, a week, two weeks) so you review each topic just as it starts to fade. Set them up together with paper blurting, a box of Leitner cards and a weekly planner, and you’ll remember far more for far less time.

This is the method I switched to after nearly failing Sec 2 Maths, on the way to 90 rank points at A-levels (the full story is here). Here’s how to set it up properly.

What’s the difference between active recall and spaced repetition?

Active recall is how you study. Spaced repetition is when you study. You need both.

• Active recall: answering a question from memory before you look. Blank-page writing, flashcards, past-paper questions with notes closed. In a classic experiment, students who practised recalling a passage remembered 61% of it a week later, against 40% for students who reread it four times. The rereaders also felt more confident (Roediger & Karpicke, Psychological Science).
• Spaced repetition: scheduling those recall sessions across days and weeks instead of cramming them into one night. A meta-analysis of 317 experiments found spacing beat massed study for long-term retention (Cepeda et al., Psychological Bulletin).

A major review of ten study techniques rated these two, practice testing and distributed practice, as the only “high utility” ones. Rereading and highlighting rated low (Dunlosky et al.).

Recall without spacing fades. Spacing without recall is just rereading on a timetable.

How do I start active recall?

Turn your notes into questions, then blurt. That’s the whole first step, and most people skip it.

Step 1. Write questions, not summaries. After each lesson, write 5–10 questions on what you learned. Put the question on one side of a card and the answer on the back. “What are the three causes of X?” beats “Causes of X: a, b, c.”

Step 2. Blurt within 24 hours. Close everything. On blank paper, write all you remember about the topic for 10 minutes. Then check against your notes and mark the gaps in a different colour. This is the paper blurting I used myself, and it needs nothing but paper.

Step 3. Use past-paper questions as recall. Do them with notes closed and a timer on. This is recall in the exact format you’ll be marked in.

Step 4. Explain it out loud. For anything you got right but couldn’t explain simply, use the Feynman technique: teach it to an imaginary younger cousin until you can do it without jargon.

The rule that makes it work: struggle before you peek. Give each question a real attempt, even 30 seconds of discomfort, before checking. Looking at the answer too soon turns recall back into recognition.

How often should I review?

Use growing gaps, and let your results decide the gap. I used the Leitner system with four boxes, reviewed at 1, 3, 7 and 14 days.

The rule is simple. Right moves a card up one box. Wrong sends it back to Box 1. A card that survives Box 4 is mostly safe until your final revision round, when everything gets one more pass.

Blurting sheets work the same way. Whatever you missed on a blurt goes into Box 1 as a new card.

These gaps are a starting point, not a law. Research suggests the best gap grows as the exam gets further away: roughly 10–20% of the time left until the test (Cepeda et al., Psychological Science). So for a national exam months away, you can stretch Box 4 to a month. For a common test in two weeks, shrink everything.

Is the 2357 method any good?

It’s a fine starting point. The 2357 method schedules reviews at gaps of 2, 3, 5 and 7 days (Birmingham City University’s revision guide explains it well). Its weakness is that it treats every topic the same. Leitner boxes spend more time on what you keep getting wrong and less on what you already know. That’s the whole game: most results for the least time.

Should I use Anki or paper flashcards?

Either works. The tool matters far less than whether you review.

• Paper cards in boxes are what I used. Move a card between boxes after each review. No screen, no notifications, and you can see at a glance how fat Box 1 is getting.
• Anki (or similar apps) schedule reviews for you, which is great if you’re disciplined about opening the app daily. The risk is making thousands of cards and drowning in daily reviews.
• A notebook with questions on the left is enough for some subjects. Cover the right side, answer, check.

Don’t over-engineer it. If you spend more time building the system than using it, simplify.

What does a spaced repetition planner look like?

A good planner has two parts: a topic log that tells you what’s due, and a weekly grid that fits recall around school. Print this one, or copy it into a notebook.

Part 1: Topic log (one row per topic, filled in as you learn it)

Write the actual dates in the review boxes when you log a topic. If a review goes badly, cross out the later dates and restart from Box 1 tomorrow.

Part 2: Weekly grid

That’s about 50 minutes a day on weekdays. It sits on top of homework, not instead of it, and on a CCA-heavy day it’s fine to do just slot 1.

How does this fit around homework, CCA and common tests?

Treat recall as the first 20 minutes of your evening, not the last. Done first, it happens. Done last, it gets eaten by homework and your phone.

• CCA days: do slot 1 only. Box 1 and Box 2 cards are the highest-value minutes.
• Common test or WA week: pause new cards and run just that subject’s Box 1 and Box 2.
• School holidays: run a full sweep of the topic log. Blurt every topic, and anything you’ve lost goes back to Box 1.

Homework counts as recall if you do it with notes closed first. Try each question cold, then open notes only for what you can’t do. You’ve just turned an obligation into revision.

What if I’m starting late?

Start anyway, and shrink the gaps. With six weeks to prelims, you can still run three or four reviews per topic.

1. List every topic for each subject on one page.
2. Do a quick blurt on each and sort it: lost, shaky or solid.
3. Spend most of your time on “lost”, some on “shaky”, and almost none on “solid”.

That triage alone beats rereading everything from chapter one, which is what most people do when they panic.

What are the most common mistakes?

• Peeking too early. Recognition feels like knowing. It isn’t.
• Making cards instead of reviewing them. Making the deck is the easy, satisfying part. Reviewing it is where the learning is.
• Only reviewing Box 4. It feels great and teaches you nothing new.
• Copying answers into “perfect” notes. Your notes exist to be tested on, not admired.
• Skipping the Sunday plan. Without it, spacing quietly turns back into cramming.