Hi,
The applicant with a B.E or B.Tech in Mechanical, Electrical, or Technology Engineering can join the Merchant navy as an Engine Cadet, Fifth Engineer or as a Junior Engineer. The Direct entry Deck Cadets have to go through a basic pre-sea training. This is mandatory to all the candidates, so you are not eligible for Merchant Navy.
But, you can join in Navy after graduation, to join in the Merchant Navy you have to give upsc exam. Through UPSC exam, you can appear after your graduation course.
Merchant Navy basically gives opportunities to candidates with science background. Most of the jobs on board are performed by marine engineers and deck officers. They look after the engineering department and navigation department. Since there are not enough shipping companies that recruits commerce graduates, but some of them do appoint commerce graduates with computer knowledge to look after the clerical jobs on board. The one who looks after the clerical jobs on board are called pursuer.
As you have mentioned about BCom, i guess you can do very well in commercial field, instead of opting for merchant navy.
Hope this helps.
Good luck.
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