Hello aspirant,

If you wish to join Indian Navy Academy after you 10+2 then firstly you must have physics chemistry and mathematics as your subject in your 12th. To join INA you need to appear for any one of the Combined National Defence Academy (NDA)/Indian Naval Academy (INA) Exam conducted by UPSC. Once you clear the exam you have the option to join Navy.

I'll also recommend you to start preparing from now for these exams if you want to get into INA.

Good Luck