Hello,

There are three ways to join Indian Armed Forces after class 12th

1. Appear for NDA
2. TES
3. Naval Tech Entry

Through NDA you can get into either of the three services (Army, Navy, Air Force). NDA is held twice a year, once in April and other in September.After clearing the written exam of NDA you need to appear for SSB then medical. After that you will be able for training at NDA Pune. There are 300 Seats for NDA

TES entry can get you into Indian Army on the basis of your MArks in class 12th. Physics, Chemistry and Maths are mandatory subjects in class 12th to be eligible. You will get to attend SSB on the basis of your 12th Marks. There are 90 seats for TES

You can get into Naval Tech through JEE Main merit

All the above mentioned three ways are Permanent Commission Service and for Officers entry only.

Click at this link to know about NDA - https://competition.careers360.com/exams/nda

Hope this was helpful