With exams approaching, every minute of revision counts. But are you using your time effectively? Research from cognitive science has identified which study techniques actually work — and which ones are a waste of time. Here are the top 5 methods, ranked by effectiveness.

1. Practice Testing (Highly Effective)

Testing yourself is the single most effective revision technique. This includes doing past papers, using flashcards, answering practice questions, and completing quizzes. Every time you retrieve information from memory, you strengthen that memory. Aim to test yourself on every topic at least 3 times before the exam.

2. Spaced Practice (Highly Effective)

Spread your revision over time rather than cramming. Study a topic, then come back to it after a gap. The "forgetting curve" shows that we forget information rapidly after first learning it, but each time we revisit the material, we remember it for longer. A good rule: review after 1 day, 3 days, 1 week, and 2 weeks.

3. Interleaving (Effective)

Instead of studying one topic for hours (blocking), mix different topics in each study session. For example, spend 30 minutes on cell biology, then 30 minutes on chemical bonding, then 30 minutes on electricity. This forces your brain to discriminate between concepts and strengthens understanding.

4. Elaborative Interrogation (Effective)

For every fact you learn, ask yourself "Why?" and "How?". Instead of just memorising that arteries have thick muscular walls, ask yourself why they need thick walls (to withstand high pressure from the heart). This deeper processing creates stronger, more connected memories.

5. Dual Coding (Effective)

Combine words with visuals. Draw diagrams, create mind maps, use flowcharts, and sketch processes. When you encode information in two formats (verbal and visual), you create two pathways to retrieve it. This is especially powerful for science topics like the digestive system, circuit diagrams, and chemical reactions.