Friend I would like to tell you There are Two Possible Ways join Indian Army after 10+2.

NDA Examination

Education:

Candidates must have passed12th in any Discipline from any Recognized Board .

Age:

19 years.

Technical Entry Scheme (10+2)

Education:

Candidates must have 12th pass with PCM subjects and should have secures aggregate of 70% in 12th board exam.

Age:
19.5 years

After Graduation :

CDS Examination Conducted by UPSC

Education:

Candidates must have passed Graduation in any stream From Recognized University

Age: 19-24 years (IMA)

NCC Special Entry

Education: Graduation in any stream with at least 50% marks
and at least B-Grade in "C" certificate exam of NCC.
Age: 19-25 years

Engineers' Entry

i). University Entry Scheme (UES)
You can apply for this only during pre-final year of B.Tech.
The age limit is 19-25 years

ii). TGC (Engineers)
This entry scheme is for final year students of B.Tech. and for B.Tech.
passed students.
The age limit is 20-27 years.

After Law

Law Graduate Enrty (JAG)
Education: LLB/LLM with at least 55% marks.
Age: 21-27 years.

After PG

Education: M.A./M.Sc. with 2nd class minimum.
Age: 23-27 years.