Hello aditya,

You should try to prepare yourself from this reference book. There are some best reference book for NDA :-

•Mathematics for National Defence Academy and Naval Academy (English) by R S Aggarwal.

•The Pearson Guide for Mathematics for NDA Entrance Examination (English) by Pearson India.

•NCERT Textbooks of all Subjects from Class 9.

•Latest Manorama Yearbook.

•NDA entrance exam by E S ramasamay.

•Success Series General Knowledge by Sachchida Nand Jha.

I hope this helpful for you.

Best wishes!!

• NCERT Class 11 and 12 mathematics books
• Mathematics for NDA or NA by RS Aggarwal
• Manorama Yearbook by M Mathew
• NDA Entrance Exam by E S Ramasamay
• Science and Technology in India by Kalpana Rajaram
• Objective general English for Competitive exams by S P Bakshi