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Long-Term Retention

Revision Engine — Never Forget What You Earned

You mastered Fiscal Policy three months ago. Can you still write a 10-mark answer on it today? Without structured revision, most of what you study fades within weeks. The Revision Engine uses the SM-2 spaced repetition algorithm to schedule revisions at the mathematically optimal moment — right before you forget.

How SM-2 works in PrepParity

Every earned note starts with a 1-day revision interval and an easiness factor of 2.5. When you successfully recall the content during revision, the interval grows — 1 day becomes 3, then 7, then 17, then 40. Each successful recall pushes the next revision further out.

If you fail a revision, the interval resets to 7 days and the easiness factor decreases slightly — the system recognises this topic needs more attention. The floor is 1.3, ensuring even difficult topics eventually space out with enough practice.

What you get

✓Daily revision queue calculated automatically at midnight
✓SM-2 algorithm with per-note interval and easiness tracking
✓Blank Canvas mode: key details redacted for active self-testing
✓Morning micro-recall notifications from your earned notes
✓Full revision history audit trail for every earned note

Streak + Heatmap

Every day you complete your revision queue, your streak grows. A GitHub-style 90-day heatmap shows your consistency at a glance. Pair it with the daily habit notification to never break the chain.

Start Revising Smarter

Revision Engine included on every plan