Check the eligibility in the official UPSC NDA notification — candidates must have passed or be appearing in 12th (PCM for Air Force and Navy wings).
Go to the UPSC website and open the NDA application link during the notification window.
Register with your basic details and fill the application form carefully.
Upload your photo and signature in the specified format.
Pay the application fee online and submit before the last date.
Save and print the application confirmation for future reference.