Formative assessment
Formative assessment is a quick, low-stakes check you do while you're still learning, like a practice question or a short quiz. It shows you what you've got and what you haven't yet, so you can fix the gaps before the real test. It's not for a final grade.
The whole point of formative assessment is to catch problems early. You answer something, you see if you got it, and then you change what you study next. A wrong answer here costs you nothing. It just tells you where to look.
Compare that to a final exam, which only says how you did once it's too late to change anything. Formative checks are the opposite. They happen often, they're small, and they're there to help you, not to judge you.
Doing lots of small checks like this is one of the best ways to remember things long term. Each one makes you pull the answer out of your head, which is what actually makes it stick.
Maya is studying for a biology test next week. She does a 10-question practice quiz on cell division and gets 4 wrong, all on the same stage. Now she knows exactly what to review, with days to spare.