Dear Applicant,

How are you doing? So let me lay out the path to join navy.

• 
  NDA & NA Examination :  Take up this exam conducted by Union Public Service Commission (UPSC). It is conducted twice a year in all major cities throughout India.

• Eligibility for this exam is

1. Age – 16 ½ to 19 years(at the time of commencement of course)
2. Nationality – Indian
3. Gender  – Men only
4. Educational Qualifications – 10+2 with Physics and Mathematics. Appearing final year students can also eligible to apply.
5. Advertisement Schedule –  May and December. (Advertisement is released by UPSC. Visit www.upsc.gov.in)
6. 10+2 B.tech Cadet Entry:
7. Age: 17 to 19½ years .

Educational Qualification:

• Passed Senior Secondary Examination (10+2 Pattern) or its equivalent from University/Board with at least 70 % aggregate marks in Physics, Chemistry and Mathematics (PCM) and at least 50% marks in English (either in Class X or Class XII).

Some good course for Navy are

• B.E./B. Tech.
• GME course. GME course is a pre-sea training course for Graduates.
• B.Sc. Nautical Science.
• DME Course (Diploma Marine Engineering)

Even though jee you can get recruited check the link below

https://news.careers360.com/indian-navy-recruitment-2020-through-jee-main