You can practice with the previous year papers, It will help you to know the level of the questions & can also refer NCERT books, it will help to clear your basic concept.

You can also devide your time subjects wise to complete your syllabus.

After completing any topic you should revise it two or three times. So, that you understood that topic completely, You can prepare your own notes during your study, it will help you in revision.

Good Luck!