The short answer
Active recall means closing your notes and pulling the answer out of your own head before you check it. A blank page, a practice question or a flashcard all work. It feels harder than re-reading, and that's the point: in controlled studies, students who tested themselves remembered far more a week later than students who re-read.
Why re-reading feels like studying but isn't
Here's the trap almost every student falls into, and I fell into it for years. You read your notes, they make sense, and your brain says, "Yep, I know this." But recognising something when it's in front of you is a completely different skill from producing it on a blank exam page. Re-reading trains the first one. The exam tests the second.
Researchers have measured this directly. In a well-known pair of experiments, students read a short passage and then either re-read it or wrote down everything they could remember without looking [1]. Tested five minutes later, the re-readers did better. Tested two days or a week later, the students who'd practised recalling it remembered substantially more. The re-readers were also more confident they'd remember it, which is the part that should worry you.
So it's not your fault you've been re-reading. It's what everyone was shown. But it is your problem to solve, and the fix is simple.
What active recall actually is
Active recall is any study where you produce the answer before you see it. Your brain has to go and find the memory, and that act of finding it is what makes it stronger. Think of a path through long grass: every time you walk it, it gets easier to find next time. Re-reading is looking at a map of the path. Recall is walking it.
A large review of ten popular study techniques rated practice testing as one of only two techniques with high usefulness. Highlighting and re-reading were rated low [3]. A meta-analysis of the practice-testing research found that practice tests beat restudying and every other comparison condition the studies used [4].
Now the cool part. It isn't only for memorising facts. In one study, students who practised recall learned the meaning of science texts better than students who built concept maps. They even did better on a final test that asked them to draw a concept map [2].
How to do it: the blurting method
Blurting is the simplest version, and it's the one I'd start with tonight.
- Pick one topic, small enough to fit on one page (one dot point of your syllabus is perfect).
- Close your book. Take a blank page and write down everything you can remember about it. Diagrams, formulas, half-sentences, all of it.
- Stop when you're stuck. Don't peek early. The struggle is where the learning happens.
- Open your notes and check, using a different coloured pen to fill in what you missed or got wrong.
- Come back in a day or two and blurt the same topic again. Your coloured-pen gaps are your study list.
That's it. Ten to fifteen minutes per topic. The coloured pen does something else that's really useful: it shows you exactly what you don't know, so you stop wasting time on what you already do.
Four other ways to practise recall
- Past exam questions, done closed-book and then marked against the marking guidelines. This is recall in the exact format you'll be tested in.
- Flashcards with the question on the front. Say or write the answer before you flip it. If you flip first, it's just re-reading in a smaller font.
- Teach it out loud. Explain the topic to a friend, a parent or an empty chair, without notes. Wherever you stumble is a gap.
- Turn headings into questions. "Photosynthesis" becomes "What are the inputs and outputs of photosynthesis, and where does each stage happen?" Then answer it before you read the section.
Active recall vs re-reading, side by side
| Re-reading | Active recall | |
|---|---|---|
| How it feels | Easy and familiar | Effortful, a bit uncomfortable |
| What it trains | Recognising the answer | Producing the answer |
| Confidence it gives you | High, often too high [1] | Accurate, because you see your gaps |
| Rated usefulness (Dunlosky et al., 2013) | Low [3] | High [3] |
| Best used for | A first read to understand | Everything after that |
Mistakes that make recall less effective
- Checking too soon. If you look at the answer the second it gets hard, you skip the part that does the work.
- Only testing what you already know. It feels good, but the gains are in the cards you keep getting wrong.
- Cramming all the recall into one night. Recall works best when it's spread out. See our guide to spaced repetition.
- Not fixing errors. Always check and correct, so a wrong answer doesn't get practised into memory.
A week of active recall for one subject
Here's a simple plan you can copy for any subject with a syllabus:
| Day | What to do | Time |
|---|---|---|
| Monday | Blurt 2 syllabus dot points from this week's lessons | 25 min |
| Tuesday | Make 10 question-first flashcards from Monday's coloured-pen gaps | 20 min |
| Wednesday | Blurt Monday's dot points again, then 1 new one | 25 min |
| Thursday | One past-paper question, closed book, marked against the guidelines | 30 min |
| Friday | Flashcards: only the ones you got wrong this week | 15 min |
| Weekend | Teach the week's topic out loud in 5 minutes, no notes | 10 min |
Sources
- [1]Roediger, H. L., & Karpicke, J. D. (2006). Test-enhanced learning: Taking memory tests improves long-term retention. Psychological Science, 17(3), 249–255. doi.org/10.1111/j.1467-9280.2006.01693.x
- [2]Karpicke, J. D., & Blunt, J. R. (2011). Retrieval practice produces more learning than elaborative studying with concept mapping. Science, 331(6018), 772–775. doi.org/10.1126/science.1199327
- [3]Dunlosky, J., Rawson, K. A., Marsh, E. J., Nathan, M. J., & Willingham, D. T. (2013). Improving students' learning with effective learning techniques. Psychological Science in the Public Interest, 14(1), 4–58. doi.org/10.1177/1529100612453266
- [4]Adesope, O. O., Trevisan, D. A., & Sundararajan, N. (2017). Rethinking the use of tests: A meta-analysis of practice testing. Review of Educational Research, 87(3), 659–701. doi.org/10.3102/0034654316689306