First you need to get your basics right to move to advanced level of preparation. And no book beats NCERT books. Because 97% of the questions are asked from NCERT books. So if you go through NCERT correct, you should score good. But for the rest 2-3%, we can recommend few books for you.

Concepts of Physics by HC Verma

Fundamentals of Physics by Halliday, Resnick and Walker

Understanding Physics by DC Pandey

Problems in General Physics by I.E.Irodov

Understanding Physics by Freedman and Young

Problems and Solution of Physics by Shasti Bhushan Tiwari

Chemistry:

NCERT Books

Modern Approach to Chemical Calculations by R.C Mukherjee

Organic Chemistry by OP Tandon

Concept of Physical Chemistry by P Bahadur

Concise Inorganic Chemistry by J D Lee

Physical Chemistry by P.W Atkins

Organic Chemistry by Morrison and Boyd

Mathematics:

Objective Mathematics by RD Sharma

Plane Trigonometry by SL Loney

The Elements of Coordinate Geometry by SL Loney

Algebra by Dr. SK Goyal Arihant Publications

Play with Graphs by Amit M Agarwal

Differential Calculus by Amit M Agarwal

Integral Calculus by Amit M Agarwal

Integral Calculus by Amit M Agarwal

Complete Mathematics for JEE Main TMH

Important points:

You need to be physically fit to be prepared for what is ahead of you.

Keep telling yourself that you can. That is important

Make sure you improve on the speed in solving sample papers and quizzes

Take online mock tests

Focus on acuracy and speed as well

Improve your concepts and focus on weaker areas

Short breaks between change of subjects is really important

Do not overstress yourself

Avoid oversleeping during the day but get adequate sleep

Dont get nervous.