Dear Sonam,

In order to prepare for Physics and Maths you need to work on your concepts. Try to build your fundamentals strong. 

You should complete your text books completely. Clear all your doubts. Solve all the exercises which are given at the end of each chapter.

You can also make your important notes which will help you in revision as well.

Focus on the topics which carries more weightage in the exam. Refer previous year papers as it is very important.

To score good marks practice is the key so try to solve as many as MCQs for your practice. 

All the Best!!