Dear Aspirant,

As you are going to give the new pattern CBSE exam that is MCQ based Keep in mind that you don't have give more than 1 or 2 minutes to each question. And the suggestion of the books would be first the all the NCERT books of the desired subjects that you have chosen then you can refer to the mcq books for all the subjects is the Together with  book . Here is the book link to buy:- https://www.amazon.in/Together-Objective-Questions-Mathematics-Chemistry/dp/9389173884

All the subjects are included in this book so do all the problems thoroughly.

Hope this helps.

Good Luck!