You can apply for Indian Navy exam, after passing ntermediate.
You should have Phsyics and maths in intermediate for NAVY.
For this you will have to pass NDA exam, whic is conducted by UPSC.
To be eligible for NDA exam -
Only those candidates can apply for NDA exams -
Who are 12th pass with Maths and Physics ( for Navy and Airforce )
Whose age is between 16.5 years to 19 years
Who is a unmarried male candidate.