Dear,

The eligibility of joining the Merchant Navy you have to be 12th with Physics, Chemistry and Mathematics. and the candidated must be unmerried Indian citizens. normal vision are required but minimum 2,5 are allow and the admission are through my writen test, screening test, and main writen examination and you have to clear the interview test, medical test, 

And you also need to complete a shipe training course and that couse will be short term course and thought basically concept of vayaging.

For  more information use below link.

http://www.maritimetraining.in/join-merchant-navy.htm

ALL THE BEST.