For both NDA and Agniveer written exams, the strongest base you can build is from NCERT textbooks (Class 9 to 12), especially in Mathematics, Science, History, Geography, and English. These give you clear fundamentals which competitive-exam questions often test indirectly, even if phrased differently. Strong basics save time and boost confidence in solving tricky problems later. https://manasadefenceacademy1998.blogspot.com/2026/01/best-book-for-nda-and-agniveer.html