There isn't one definitive list of the absolute best books for the NDA exam, there are some highly recommended resources that can be incredibly helpful for your preparation, here are some to refer.
1
These aren't flashy or fancy, but they provide a rock-solid foundation in mathematical concepts that you'll absolutely need for the NDA.
2
This book is a great resource for practicing all the different areas of mathematics that could show up on the NDA.
3
This book is specifically designed for the NDA exam and covers all the relevant mathematical topics.
4
This book covers a broad range of science topics, including physics, chemistry, and biology.
5
This book is a comprehensive guide to general knowledge, covering topics like history, geography, current affairs, and Indian polity.
6
It covers national and international events, as well as important government policies and schemes.