Hi, The merchant navy is not exactly about jobs abroad. Also I am not sure of taking up courses especially online ones as they be recognised or not. I think you should ask your college and teachers about this as they will know better. Personally I wouldnt suggest doing two courses at a time. 

How about checking IMU which is a central university and offers all very good long term courses at its various campuses? it can be checked here http://www.imu.edu.in/images/CET2017/IMU%20Academic%20Brochure%202017-18.pdf

 

 

You can take up job experience firstly with Indian Navy and alongwith that you can learn more about Marine Engineering related Technical courses via online mode to gain expertise in this domain.

The top colleges which offer Distance learning and chance for International exposure into Navy and Marine Engineering domajn have been shared below for reference.


https://www.hotcoursesabroad.com/india/training-degrees/international/distance-online/marine-engineering-courses/smode/3/cgory/g18-3/sin/ct/programs.html

The course takes deeper dive into Metals and fluid Dynamics, Under Water Missile Tracking, Ship and Port management, Wartime Missile Launching, etc.

This will help you be industry ready with more relevant experience and hence, you can take up opportunities abroad with best in class training.

All the very best for your career..!!!