Mechanical Engineering Scope

Yes dear. Career as a Merchant Navy could be in 2 fields mainly - Engineer or a Cadet. Other fields could be catering, junior offiecers, etc. Subjects Required :Only PCM students can apply. Entrance Exam
IMU- CET :Indian Maritime University conducts an entrance exam IMUCET for various courses such as B.Sc. Nautical Science, B.Sc. Marine, B.Sc. Marine Catering, etc. You are also required to clear an interview and medical check-up. JEE T. S. Chanakya, Marine Engineering & Research Institute, Kolkata, & National Maritime Academy, Chennai, etc. Accepts JEE score. They are required to fill the forms for IMU as well. Colleges offering B.Sc. Nautical Science/ B.Sc. Marine Science/ Diploma in Nautical Science
HIMT College (Hindustan Institute of Maritime Training)
Tolani Maritime Institute
Anglo Eastern Maritime Academy
Applied Research International School of Maritime Studies
Great Eastern Institute of Maritime Studies
Post Graduate Diploma in Marine Engineering
Coimbatore Marine College
HIMT College Hindustan Institute of Maritime Training
B.Tech (Marine Engineering)
Coimbatore Marine College
Euro Tech Maritime Academy
HIMT College (Hindustan Institute of Maritime Training)
International Maritime Institute
Samundra Institute of Maritime Studies
NOTE :You can also get into Merchant Navy after a regular engineering degree.

For a mechanical engineer, most apt MBA could be operations management, as or is closely related, and could help mechanical engineers to apply the techniques to shop floor, operations and in field. Supply chain management is offered in few colleges, and is also apt for mechanical engineers. At tier-1 and 2 colleges however, courses in demand are Finance and marketing, at the end of the day, there is no best course, depends on your interest, aptitude, temperament and passion. My advice is not to venture into MBA unless it is in Tier-1 or at least Tier-2 colleges. Attempt CAT or GMAT after at least a couple of years work experience, select reputed college to join, after all you could afford to wait, as you are already employed.