As you want to get the details of process to enter in Merchant Navy job so here is the information of the same for you:

I want to tell you that firstly you must pursue courses like Nautical Science and Marine Engineering and here for your reference I am giving you the details of these 2 courses:

Educational Qualification:
The minimum eligibility for courses in Nautical Science and Marine Engineering is 10+2 or an equivalent examination with physics, chemistry and mathematics.

Selection:
Candidates are selected for the B.Sc. Nautical Science degree of TS Chanakya, Mumbai; and the four-year Marine Engineering degree course at Marine Engineering Research Institute, in Calcutta and Mumbai, known as DMET, through the Joint Entrance Examination conducted by the Indian Institute of Technology (IIT)