You need to do the practise & study till the time you are not confindent with the chapter or topic of particular subject.

Here are some points you can prefer:

Make sticky notes : Make a formula book for your reference and write all important formulas in it. In order to make learning formulas easy, you make different sections for Physics, Chemistry and Mathematics. Sticky notes play a pivotal role during the preparation & last minute revision.

Make the formulas interesting: Mental visualization is important to check whether you remember the formulas or not. Close your eyes and try to recollect the formulas. You should also try to write the formula on a blank paper after a few hours of break from the study. This will help you judge your remembrance power.

Take formula tests frequently: Take Online Test Series regularly to remember the formula. Frequent test will boost your confidence level as well. It is also a great revision technique.

Visualise what you study- Highlight the important sentences and concepts because when writting you will remember better.

Be Confident- The most important is that you should be confident & positive with your preparation. It will help you to learn the concepts till the exam.

Good Luck!

You have to do regular revision in order to learn all the formulae till the end. You have to clear your basics to understand the concepts and to build your fundamentals strong. You can also make your importat notes it will help you in revision.

You should make your proper time table and you should revise daily.

All the Best!!