Firstly I would suggest you to go through well with NCERT books after that you refer other books. Here are some of the books for Chemistry given below.

Chemistry - Objective Dinesh

Physical chemistry- By O.P. Tandon

Organic Chemistry by Paula Bruice Yurkanis

Here are some of the important tips you can follow:

Don’t cramming chapters and try to understand and learn concepts.

Keep giving online test and mock sample papers to test your knowledge and how well you can handle exam pressure.

Clear exam strategy: you know very well, what’s your strength and weaknesses. Try to solve those questions in exam in which you are good.

Don’t be pessimistic and always keep hope in your heart and mind that you are going to crack this.

Good Luck!