How to revise effectively: 5 science-backed techniques

You spent 6 hours rereading your flashcards and feel like you know nothing the next day? That's normal. Rereading is the most popular study method among students, and also one of the least effective according to cognitive psychology research.

Here are 5 techniques that actually work, backed by decades of scientific studies.

1. Active recall

Instead of rereading, close your notes and try to retrieve the information from memory. Ask yourself questions: "What are the 3 causes of the French Revolution?" then check your answer.

Why it works: every time you force your brain to retrieve information, you strengthen the neural pathway to it. Rereading doesn't create this effort.

How to apply it: after each lecture, close your notes and write down everything you remember on a blank sheet. Then compare with your notes. The gaps are exactly what you need to work on.

2. Spaced repetition

Cramming everything the night before is short-term thinking. It might get you through the exam, but you'll forget everything within a week. Spaced repetition means reviewing information at increasing intervals: the next day, then 3 days later, then a week, then a month.

How to apply it: plan your revision sessions in advance. If your exam is in 3 weeks, start now with short sessions (20-30 minutes) spaced a few days apart.

3. Interleaving

Instead of studying one subject for 3 hours, alternate between multiple subjects in the same session. It feels less effective in the moment (you feel like you understand less), but studies show it improves long-term retention.

How to apply it: split your study session into 25-30 minute blocks and switch subjects with each block. Monday: 30 min law, 30 min economics, 30 min law.

4. Elaboration

When learning a concept, ask yourself "why?" and "how?". Don't just memorize that "photosynthesis produces glucose". Understand why the plant needs light, how water is broken down, what role chlorophyll plays.

How to apply it: for each important concept, write an explanation as if you were teaching it to someone who knows nothing about it. If you get stuck, you don't understand it well enough yet.

5. Structured revision sheets

A good revision sheet isn't a course summary rewritten in smaller font. It's an active recall tool: questions on one side, answers on the other. Or an outline with key concepts that lets you reconstruct the lecture from memory. The Cornell method is built around this exact principle — the left cue column acts as your question side, the right column as your answer side.

How to apply it: create your sheets throughout the semester, not the night before the exam. And use them actively: read the question, answer from memory, then check.

The winning combo

The optimal strategy combines these techniques: take structured notes during the lecture, create revision sheets during the week, then use active recall and spaced repetition to study. If you're still struggling to capture notes during class before you can even think about revision, check out our article on why you miss information in lectures.

Tools like Hekko automate the first step: note-taking and sheet creation. That leaves you more time for what really matters, active revision.