What spaced repetition is
Spaced repetition means reviewing material in several short sessions spread out over days and weeks, instead of one long session the night before. Same total time, different schedule. That one change is among the most consistent findings in learning science: a large meta-analysis of spacing research by Cepeda and colleagues, covering decades of experiments, found that spreading practice out reliably beats massing it together for long-term retention. Your brain treats information it keeps meeting on different days as worth keeping.
The forgetting curve
In the 1880s, Hermann Ebbinghaus ran some of the first controlled experiments on memory, testing himself on what he could recall after different delays. He found that forgetting follows a curve: steep at first, then flattening. You lose the most right after you learn something, and whatever survives the early drop fades more slowly. Crucially, he also found that each well-timed review pushes memory back up and makes the next decline gentler. Review at the right moments and the curve flattens out into something close to permanent.
Why cramming fails
Cramming is not useless, which is exactly why it fools people. Stuff vocabulary into your head on Thursday night and you really will know it Friday morning. The problem is the steep early part of the curve: a single massed session sits at the very start of it, so the gains drain away within days. If your SAT is three weeks after your big study push, cramming hands most of your work back to the forgetting curve.
Spacing also wins for a deeper reason. When you return to material after a gap, recalling it takes a little effort, and that effort is the point. Researchers call it a desirable difficulty: the slight strain of reaching back for a half-faded memory is what strengthens it. Cramming feels smooth because nothing has faded yet, and that smoothness is why it builds so little.
How to schedule reviews for SAT vocab and skills
You do not need a perfect algorithm to benefit. A simple expanding schedule captures most of the effect: review new material the next day, then a few days later, then about a week later, then a couple of weeks after that. Each time you recall something successfully, let the next gap grow. Each time you miss it, shrink the gap and see it again soon.
For vocabulary, that means flashcard rounds where the words you know well show up rarely and the words you keep forgetting show up often. For skills, like comma rules or systems of equations, it means returning to a topic for a short set of practice questions days after you first drilled it, rather than considering it done. And make every review a self-test, not a re-read. Spacing schedules the work; active recall is what makes each review count.
How PsychSAT automates it
Tracking dozens of skills and hundreds of words on paper is the part that makes most students quit, so PsychSAT does the scheduling for you. The vocabulary trainer is a spaced repetition system: after each card you rate how well you remembered it, and that rating sets when the word comes back. Easy words wait weeks; shaky words return within days; forgotten words show up the next day.
The same idea runs underneath your study plan. PsychSAT tracks your mastery of every SAT skill and schedules review days when a skill is due, sooner for the ones you struggle with, later for the ones you own. Missed questions resurface for another attempt instead of disappearing into your history. You just show up and practice; the forgetting curve is handled.
Start earlier than feels necessary
Spaced repetition has one requirement: time. The technique cannot help you the night before the test, which is exactly when crammers do their work. Starting even a few weeks earlier with shorter sessions will outperform a heroic final weekend, and it pairs naturally with the rest of good prep, like the realistic full-length tests covered in our Bluebook practice test guide and the calm that preparation builds, covered in our test anxiety guide.