Benefits of Joining a Coaching Institute for NDA Exam https://www.trishuldefenceacademy.in/benefits-of-joining-a-coaching-institute-for-NDA-exam The NDA exam is a joint entrance test for the three armed forces – Army, Navy, and Air Force. Conducted by the Union Public Service Commission (UPSC), it is considered an opportunity for students who want to join any of the armed forces of the country. They should go for the best NDA coaching in Dehradun for the following reasons.