Hello,

You can join navy after 12th by two ways.

NDA and NA examination:

NA examination is conducted by UPSC (union public service commission)you can join through this. It conducted twice a year throught india. In all major cities. And the age is 16 1/2 to 19 years time of commencement of course. Educational qualifications 12th with mathematics and physics. Gender - men. Nationality - Indian. You can visit official website for more information.

10+2 btech cadet entry :

Educational qualifications 10+2 or board with atleast 70% aggregate with physics, mathematics,chem and atleast 50% in english class 10 or 12. You can apply directly online with official website.

Thankyou..