NDA Exam Day Instructions and Guidelines 2023 The National Defense Academy (NDA) exam is a highly competitive exam conducted by the Union Public Service Commission (UPSC) for admission to the Indian Army, Navy, and Air Force. The exam is conducted twice a year, usually in April and September. Here are some instructions for candidates appearing for the NDA exam: Admit Card: Candidates must bring their NDA Admit Card with them to the exam center. The Admit Card can be downloaded from the UPSC website. Reporting time: Candidates should reach the exam center at least 30 minutes before the reporting time