Hi Ramakant,

Following are the defence entrance exams you can appear for :-

1.NDA

2.CDS

3.AFCAT

4.Indian air force group X

5.Indian air force group Y

6.Indian navy sailor entrance 

7.Indian army b.sc.nursing

8.Central armed police force

9.India coast guard exam

10.NIF by upsc ;etc.

So these are few entrance exams which gave you a entry into the indian defence services easily.

For detailed information checkout the official websites of these exams like upsc,etc; to know the exact dates,eligibility criterias,etc.

Good luck.