Dear Ronak,

       You will be able to score well if your cocepts are clear in each of the subjects. The number of hours do not matter here. You need to attempt a lot of mock tests in order to acquaint yourself for the real examination. NCERT books are very good. Put in extra effort. Also, divide your day in such a manner that you are able to distribute time for all the three subjects equally. If you have any doubt, get it cleared. If you are consistent, you will be able to score well.

Wishing you all the best