You can refer Arihant Publication book for NDA.

In addition to it for your Genaral ability and general knowledge part, refer to the class 10th books of Social Science and Science, which will cover you history, civics, political science and geography part, and the other one will cover you physics, chemistry and biology.
For general knowledge, you can refer Pratiyogita Darpan.
For Mathematics, Arihant refresher
For English vocabulary and grammar- Arihant

Good Luck!

Some of the important and recommended books for NDA preparation are:

Manorama Yearbook by Mathew



NDA and NA by RS Agarwal



Pathfinder for NDA and NA



Sectionwise solved papers for NDA by Arihant



You can refer to the above books available in general book stores.



Good luck.

National Defence Academy & Naval Academy Examination

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