Help me to get job in millitry ,just after my completion of 12 th boards

Greetings aspirant!

Really good to see you want to join this reputed field. There are two ways through which you can join army

(1) NDA and NE examination.
(2) technical entry scheme for high school science graduates.

NDA admission happen twice a year. Age should be between 16 1/2 to 19 1/2 years. Candidate should be 12th Class of 10+2 for Army and with Physics and Maths for AF/Navy. Marital status should be unmarried.

TES entry also opens twice a year. Candidate should be 10+2 Physics, Chemistry & Maths (aggregate 70% and above to apply) and between 16 1/2 to 19 1/2 age.

Here's a link containing more information.

https://competition.careers360.com/articles/How-to-join-the-Indian-Army

Hope you find it helpful.
Thankyou!