Hello Shivam,

For chemistry, physics and biology ncert books is sufficient. Most of the questions are asked from only ncert book only few will comes from outside.

For the preparation, first go for ncert books for all subjects, it helps to clear your doubts and clear concept.

But, if you want to practice more than you will go for these books for each subject:

1. For physics

• Concepts of Physics by H. C. Verma
• Objective Physics By DC Pandey
• Fundamentals of Physics by Halliday, Resnick and Walker
• Fundamental Physics by Pradeep
• Problems in General Physics by IE Irodov

2. For chemistry

• Physical Chemistry by OP Tandon
• ABC of Chemistry for Classes 11 and 12 by Modern
• Concise Inorganic Chemistry by JD Lee
• Dinesh Chemistry Guide
• Practise books by VK Jaiswal (Inorganic), MS Chauhan (Organic) and N Awasthi (Physical)

3. For biology

• Biology Vol 1 and Vol 2 by Trueman
• Objective Biology by Dinesh
• Objective Botany by Ansari
• Pradeep Guide on Biology
• GR Bathla publications for Biology

Hope this will help you. All the best.

I want to say that it is sufficient but it is necessary because most of the questions will be asked from NCERT in chemistry and Biology but to master physics unit to solve many problems and I don't think that Chemistry Physics NCERT is easy to understand so you need to solve problems for other broke so that you will be able to solve the problems and the exam so I think first you should cover NCERT and then only you need to switch to other books if you got time so yes you are plan is good first focus Justin NCERT and master everything of it