There is a reason most students feel like they are studying constantly but retaining very little: the way they study is fundamentally at odds with how memory actually works. Re-reading notes, highlighting passages, and reviewing material shortly after learning it are among the least effective study methods researchers have ever measured.
Spaced repetition is the opposite approach — and the evidence behind it is among the most robust in all of cognitive science.
Spaced repetition is a study method in which you review material at increasing intervals over time, with each review triggered just before you are likely to forget it. The key mechanism is the spacing effect: memory traces are strengthened more by practice that is spread out over time than by practice that is massed together.
In practical terms: reviewing a concept on day 1, then day 3, then day 7, then day 14 produces far stronger long-term retention than reviewing it four times in a row on day 1.
Re-reading creates a feeling of familiarity — you recognise the material as you scan over it, and that recognition feels like learning. It is not. Familiarity and retrievability are different cognitive phenomena. You can recognise something as familiar and still be completely unable to recall it when you need it — on a test, in an argument, under pressure.
Spaced repetition forces retrieval practice: you have to actively pull the information out of memory rather than passively recognise it. That act of retrieval, especially when difficult, is what strengthens the memory trace.
Option 1: Anki (free, recommended). Anki is a flashcard application that uses a spaced repetition algorithm to schedule your reviews automatically. You rate each card by difficulty (Again / Hard / Good / Easy) and the algorithm adjusts the interval accordingly. Cards you find easy get reviewed less frequently; cards you struggle with come back sooner.
Download Anki at ankiweb.net. Create a deck for each subject you are studying. For the LSAT, make cards for: common logical fallacies, conditional logic rules, question type definitions. For the MCAT, make cards for high-yield content — enzyme kinetics, psychological theories, biochemical pathways.
Option 2: Physical flashcards with a box system. Divide a box into 5 sections. New cards go in section 1. When you get a card right, move it to the next section. Wrong answers go back to section 1. Review section 1 daily, section 2 every other day, section 3 every 4 days, and so on. This is the analogue equivalent of the Anki algorithm.
The most common mistake with spaced repetition is making cards that are too complex. Each card should test one atomic fact or relationship. Instead of a card that says 'Explain the TCA cycle,' make ten separate cards: one for each enzyme, one for each substrate and product, one for the net outputs.
For reasoning-based tests like the LSAT, spaced repetition works best for the building blocks: question type definitions, common logical fallacies, valid inference patterns, vocabulary in RC. The application of these blocks to novel passages is a separate skill built through practice — spaced repetition gives you the raw material to apply.
A mature Anki deck requires 15–20 minutes of review per day to maintain. Building the deck takes longer at first — plan for 30–45 minutes per day during the initial content-loading phase. Once you are in maintenance mode, the time investment is minimal and the retention is extraordinary.
Students who use spaced repetition consistently for 8 weeks typically report that content they studied in week 1 remains accessible in week 8 — not because they reviewed it constantly, but because the algorithm brought it back at exactly the right moments.