Diploma

The Graduate Marine Engineering (GME) course provides mechanical engineering graduates an opportunity to take up one year course and enter merchant navy by becoming a marine engineer.
In order to become a marine engineer after doing mechanical engineering, one needs to do a compulsory 1-year Graduate marine engineering course.
As an academic discipline, Marine Engineering covers concepts and processes involved in the manufacture, designing and operation of ship machinery and engines. The discipline is about the science of nautical architecture. Marine engineers are responsible for supervising the engine crew involved in operating marine vessels and equipment. Their responsibilities also include checking for the smooth functioning of electric motors, steam engines and propulsive engines etc. Marine engineers constantly work to improve the efficiencies of gas turbines, existing shipboard conventional steam equipment, nuclear propulsion plants and diesel plants.

http://www.iceel.net/custom-clearing-freight-forwarding.php
First of all in this export import segment a very depth understanding is much required because it's all about international business such as international payments, logistics, cultural, political, market. You can do from Symbiosis but try to get admission in fieo BIMTECH one than, 2 option is welingkar, 3 option is indian institute of packing, indian institute of materials management
you can do Diploma from fieo has two courses one is with BIMTECH and other one is with welingkar https://www.welingkaronline.org/ForeignTradeManagement?code=67
https://www.bimtech.ac.in/happening/49/bimtech