If You are in class12th then The Best Exam to become an officer in Indian Armed forces is NDA, Which is held twice a year one in the month of April and other in the Month of September consisting of Two stages one is written test and other is SSB interview which is 5 Day interview which tests for Your Psychological, Thinking and Medical Tests.

The written exam consists of two paper one is general ability test and other id Mathematics, One must be very good at class 12th level Mathematics to crack NDA exam and The toughest part of NDA is the SSB interview so Only If You possess an Officer like qualities You will be able to qualify it otherwise Not.

You can read more about NDA here.

https://competition.careers360.com/exams/nda