The National Defence Academy also known as NDA, is the Joint Services academy of the Indian Armed Forces. The NDA is situated at Khadakwasla near Pune, Maharashtra. National Defence Academy provides education for the three services, the Army, the Navy and the Air Force train together before they go on to respective service academies for further pre-commissioning training. National Defence Academy (NDA) is the first tri-service academy in the world. Candidates who completed their 12th standard, are eligible for NDA exam. There is no limitation for attempts in NDA exam, however there is a age limit for this exam which is 16.5 to 19.5 yrs. NDA exam is conducted by UPSC (Union Public Service Commission) two times in a year.
Here, the syllabus for National Defence Academy (NDA) exam is available, you can get it from following link.