Hello Aspirant

You can join Indian Navy after 12th by two way:

1. NDA & NA Examinations
2. Technical Entry Scheme- TES

You can join Airforce by only one way i.e., NDA and NA Examination.

Here I am providing you a link where you can visit to check for eligibility criteria and all the details pertaining to Indian Navy and Airforce.

https://www.careers360.com/articles/Universities/How-to-join-Indian-Army-Navy-Air-Force

Please refer to the link given. It will help you best.

Feel fee to ask your queries in comment section.

Thanks.

Good luck.