The trouble with revision that feels easy

There is a decent rule of thumb for revision: if it feels comfortable, it isn't working. I've watched it happen more times than I can count. A student confidently closes their revision guide, sits down, and produces almost nothing on paper - not because they hadn't worked, but because reading it back had quietly convinced them they already knew it. The material was familiar, it went in smoothly, and they finished each session with a real sense of having covered a lot.

The problem is that familiarity isn't the same as recall. Psychologists who study this describe it as an illusion of fluency: we judge how well we know something by how easily it reads, not by whether we can produce it from memory. The exam doesn't ask you to recognise the mole equation; it asks you to recall and use it, under time pressure.

So, the better test is the uncomfortable one. Close the book, write down everything you can remember about the topic, then check what you missed. What you've just found is the actual gap...and it was invisible thirty seconds earlier.

It feels worse. It works better.