Hello,

NDA is conducted by UPSC twice a year, and eligibility criteria for Army Wimg is passes 10+2 from a recognized board, in case of Air Force ad Indian Naval Academy, it's mandatory to have Physics and Mathematics at 10+2 level, only unmarried males are allowed for this exam, and their age should be between 16.5 and 19.5 years.

NDA is conducted in offline mode having Mathematics(120 questions) and GAT(150 questions), each for a duration of 2 hours and 30 minutes, total marks is 900.

You can only give the exam twice a year as per norms of governing body.