Study out of order (on purpose)

The study method that feels best is blocked repetition: twenty exercises of the same kind, a whole afternoon on a single topic. It flows, it comes out effortlessly, it feels mastered. And that's the trap: the fluency belongs to the repeated gesture, not to the knowledge.

Psychologist Doug Rohrer tested it with maths students: some practised in blocks, others worked through the same exercises shuffled, so that each problem arrived without warning of its type. During practice, the shuffled group did worse and felt worse. Weeks later, on the surprise test, they nearly doubled the blocked group's score.

The explanation is simple: life doesn't tell you which formula applies. Half of any exam is recognising what kind of problem you're facing, and blocked practice removes exactly that training, because the answer to «what comes next?» is always the same.

The application: shuffle. Mix topics within one session, alternate exercise types, weave the old in with the new. You'll notice you move slower and make more mistakes. That discomfort isn't a sign it's going badly: it's the sound of learning taking root.