NDA examination pattern
There is written exam and after that a final interview round for selection
NDA written exam paper has two sections
            Maths + General ability test
Mathematics (Objective type):             300 Marks
General Ability Test (Objective type):  600 Marks
Total marks for written examination: 900 Marks
Total marks for Interview round:        900 Marks
NDA exam eligibility criteria
Candidate must have passed 10+2 from a recognized board in India. The students appearing for 10+2 can also apply
Candidate must have studied Mathematics and Physics in 10+2
Candidate must be unmarried
Candidates must be physically fit
National Defence Academy (NDA) exam is conducted by UPSC twice every year. All candidates who are interested in joining Indian Army, Navy or Air Force, can appear for NDA examination. NDA exam is known as the best way to join the Indian defence forces as an officer. 

Notification of Examination:

October – November & April – May

Conduct of Examination: 

April – May & Sept. – Oct