Friend,
NDA EXAM is conducted by upsc twice a year once in the month of april and second in the month of september.Through this exam a candidate can join any of the three forces of india.
1)INDIAN ARMY
2)INDIAN NAVY
3)INDIAN AIR FORCE
After clearing this exam you will undergo one SSB interview and then medical test.then you will join NATIONAL DEFENCE ACADEMY.The ssb interview is conducted in five days with following tests
1)psychological test
2)word association test
3)thematical apperception test
4)personal interview
5)group tasks
THE ELIGIBILITY CRITERIA FOR NDA EXAM IS:
1)A candidate must have passed the 10+2 class or higher secondary education.
2)A candidate must be have a nationality of indian,subject of bhutan or Nepal, a Tibetian refugee.
3)A candidate should be unmarried.
4)A candidate should be born on or after 2nd January 1993 and before 1st July 1995
or between the age of 16.5 years to 19 years.
5)a candidate should be physically fit.