Hello Vikash,
Hope you are doing good.
So as per your query, the best books for the preparation of  NDA exam are as follows:
For the purpose of,
1. Physics and chemistry, NCERT books are the best
2. Quantitative Aptitude, RS Agarwal
3. Mathematics, RS Agggarwal
4. For the total syllabus, ES Ramaswamy for NDA
Hope it helps you!!

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