Dear Tejas,
Step 1 -> Try to learn important definitions, derivations and formulae. After this, you can score at least 30 marks

Step 2-> Prepare a separate notebook for all the diagrams in NCERT. It's a bit time consuming and it might take 34 hours, but trust me its worth it. Drawing a diagram related to the answer in your answer sheet is helpful in scoring extra marks.

If you go through the answer sheets of previous year toppers, you will find that almost every answer was accompanied by a diagram.

Step 3-> Solve NCERT examples and exercise. You will find many questions in the paper which are directly copied from the textbook.

Step 4 -> Go through previous year questions of last 5 years.

After following this method, you can easily score 60 + in exams.

PS:- If time permits , read the sample paper issued by CBSE to get a basic idea about this years paper.

All The Best!