Hey Sujata Patil,

To prepare physics derivations you have to follow the steps mentioned below:-

1. Read a derivation thoroughly.

2. Write the derivation on a page by copying it.

3. Now divide the derivation into respective 3 or 4 parts.

4. Practice out memorizing and writing every part seperately.

5. In the end, try to write the whole derivation together.

Writing from your hand is always better than memorizing something as your hand also memorizes the thing you are writing.

Note - These steps are suitable for almost every exam like JEE Main, Board exams, NDA etc.

I hope it helps you.

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Good Luck for your exam.