Are you an NDA aspirant and confused on which institute to choose for the best preparation? We suggest you Trishul Defence Academy. Read more to know why? NDA is considered as one of the most prestigious job by Indian Armed Forces. It is a National Level Examination Conducted by UPSC twice in a year; this exam provides the opportunity to the students to become an Officer. In Indian Navy, Indian Army and Indian Air Force. The examination is divided into two tiers i.e. written examination & SSB interviews. Those who pass both will get admission in NDA (National Defence Academy)