The National Defense Academy is abbreviated as NDA. The UPSC administers the NDA test for admission to the Army, Navy, and Force wings of the NDA. The exam acts as a stepping stone for applicants interested in joining the army, navy, or army force. To put it another way, candidates must be between the ages of 16.5 and 19.5 to be considered for the exam. Female and married male candidates are not eligible to take the NDA Exam. For more details please contact us! 9810669467.