Describe the NDA Exam. For the Army, Air Force, and Navy of India, the UPSC administers the NDA exam to students seeking admission. The UPSC administers a national-level defence test twice a year. Candidates must pass NDA 1, the first portion of the exam, in order to move on to the written portion. Candidates must pass NDA 2, the second portion of the exam, in order to advance to an SSB personality test and interview (Service Selection Board). The UPSC NDA test consists of two selection processes: a written exam and an SSB interview. It is offered twice a year. Learn more about other Indian government exams.