What study habits actually improve long-term memory and retention?

The most effective study habits for long-term retention are backed by cognitive science. Spaced repetition is the most powerful technique, where you review material at increasing intervals over time rather than cramming. Testing yourself actively, called retrieval practice, strengthens memory far more than rereading notes. Interleaving different topics or problem types in a single session also improves retention compared to blocking one subject at a time. Other proven habits include elaborative interrogation, which means asking yourself why and how things work rather than just memorizing facts, and connecting new information to things you already know. Sleep is critical since memory consolidation happens during rest. Minimizing distractions during focused study sessions and keeping sessions shorter but more frequent also outperform long marathon cramming sessions.