Dear Student,

Girls can't join Indian Navy or Indian Airforce just after 12th, they need to complete their graduation first then only she will be eligible to join any defence force through CDS, AFCAT, INET or SSC-tech entry, before that they will not be eligible.

There is one option for the girls just after 12th if she wants to serve in the medical department. MNS entry is for girls where the qualification is 10+2 with Physics, Chemistry, Biology, English as compulsory subject. You can apply that form if you wants to pursue bsc nursing and they will post you in various Army hospital.

Hope you find it useful.

Good Luck :)