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Study skills · Guide

Spaced Repetition, Explained Simply

One of the best-evidenced study techniques there is — and one of the simplest to start. Here's what it means, why it works, and a schedule you can begin today without any app.

5 min read Updated July 2026 By KS Academia Prep

The short answer

Spaced repetition means reviewing material at spread-out, increasing intervals — just as you're about to forget it — instead of cramming it all at once. Each well-timed review resets the forgetting, so the same total effort produces far more durable memory.

You can start today with nothing more than a calendar. Apps automate the timing, but the technique works perfectly well on paper.

The forgetting curve

Learn something today and, without review, most of it fades within days — a pattern often called the forgetting curve. This isn't a flaw to be ashamed of; it's how memory works. The useful discovery is what happens when you review at the right moment: each review flattens the curve, so you forget more slowly next time, and after a few well-timed reviews the knowledge becomes genuinely durable. The trick is timing the reviews to land just as the material starts slipping — not so soon it's still fresh (wasteful), not so late it's already gone (relearning from scratch).

What spaced repetition is

Spaced repetition is simply that principle turned into a method: review material at increasing intervals — a day later, then a few days, then a week, then a fortnight — with each successful recall earning a longer gap before the next review. Compared with cramming (all your reviews bunched into one session), the same number of reviews spread out produces dramatically better long-term retention. For subjects built on remembered facts, definitions and vocabulary across two years, that's exactly the kind of memory the IGCSE and IB reward.

A schedule you can start today

You don't need software to begin. A workable starting schedule for a new topic:

  • Day 0 — learn it.
  • Day 1 — first review: close the book and recall it from memory.
  • Day 3 — review again; whatever you'd forgotten, relearn.
  • Day 7 — review.
  • Day 14, then ~Day 30 — final spaced reviews.

Each "review" should be retrieval — recalling from memory, not re-reading — because spacing and self-testing are strongest together. Jot the review dates straight into a calendar or planner when you first learn a topic, and the schedule runs itself.

In practice

Don't try to space everything at once — it becomes unmanageable. Start with the highest-value material: the facts, formulae and definitions you keep forgetting. Those are where spacing pays off most.

With or without apps

Apps like Anki automate the whole thing — they track what you know and schedule each card's next review for you, which is genuinely convenient for large volumes like vocabulary or definitions. But the technique doesn't depend on an app; a stack of paper flashcards and a calendar work perfectly well, and for some students the simplicity is more sustainable than yet another app to maintain. Use whichever you'll actually keep up. Try the free spaced-repetition scheduler — enter your exam date and get your review dates, plus a calendar file you can add straight to your phone.

What it's good for — and not

Spaced repetition shines for material that is fundamentally about remembering: vocabulary, definitions, formulae, dates, labelled diagrams, key facts. It's less directly useful for skills that are about doing rather than recalling — writing a strong essay, structuring a data-response answer, solving unfamiliar problems. Those improve mainly through practice and feedback. The honest picture: spaced repetition is a superb tool for the memory half of studying, and should sit alongside plenty of applied practice for the rest. For the fuller toolkit, see the science of studying.

Key takeaways

  • Review just before you forget — each well-timed review flattens the forgetting curve.
  • Increasing intervals: a day, a few days, a week, a fortnight — spread beats crammed.
  • Make each review active recall, not re-reading — spacing and self-testing work best together.
  • Best for facts and vocabulary; pair it with applied practice for essay and problem skills.

Common questions

How is spaced repetition different from just revising?

Ordinary revision often means re-reading whenever there's time. Spaced repetition is deliberate: you review at planned, increasing intervals timed to just before you'd forget, and each review is active recall rather than re-reading. That timing and testing is what makes it far more efficient than unplanned revision or cramming.

Do I need an app like Anki for spaced repetition?

No. Apps automate the scheduling, which helps with large volumes, but the technique works with paper flashcards and a calendar. Use whichever you'll actually keep up — an abandoned app helps no one, and a simple paper system you maintain beats a sophisticated one you don't.

If you'd like a next step

Structure is easier to add than willpower

Most study struggles ease when a student has a set time, a distraction-free place, and a little accountability. Our parent guide walks through how to build that — and if your child is enrolled with us, a supervised study setting is one ready-made way to provide it.

Read the Independent Study Guide How supervised study works

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