To join a defence academy like the National Defence Academy (NDA), candidates must meet specific eligibility criteria. They must be Indian citizens, unmarried males or females, and between 16.5 to 19.5 years of age at the time of course commencement. Academically, a candidate must have passed or be appearing in Class 12 (with Physics and Math for Air Force and Navy). Physical fitness, good eyesight, and mental soundness are also mandatory. The best defence coaching in India helps candidates understand these criteria in detail and ensures they are fully prepared—academically, physically, and mentally—to meet them. Coaching centers also guide students through application procedures, documentation, and medical standards required for successful admission to top defence academies.