Hello!

This method might work for boards but for tough competitive exams like JEE and NEET, the important thing you must do is to attempt different questions. On a single topic, many kinds of questions can be framed with varying difficulty. So it is essential to practice more. Ofcourse, it is not practically possible to cover all kinds of questions. However, you must try to solve as many new kinds of questions as possible. This helps you to understand the topic in a better way.

And doing notes comes handy. Along with it, make a list of formulae and revise everyday so that you dont feel difficulty in remembering the formula when needed. Also, as you are doing, keep attempting mock tests.

All the best!