Dear Arun ,

Im really happy to say that you wants to join Defence course ,we will discusses some part of defence like Army ,Indian Airforce and Indian Navy ,  indian coast guard .In every part they will provides various opportunities to join defences in various levels like they are provides different categories job and every categories have different criteria like education ,age ,health and many more but you had not mentioned about you and your education so it will difficult to share our accurate answer with you.

Hope it will helpful

Thanks