Career

The Indian Maritime University (IMU) is a Central University, that was established by by GOI in 2008. It is the only university in the country imparting education in the maritime field. It has an All-India jurisdiction and the headquarters is at Chennai. It has campuses at Chennai, Kolkata, Mumbai, Visakhapatnam, Cochin and Kandla Port. It conducts Join Entrance examination for admission to various Maritime courses for its affiliated colleges. You can chose among Diploma/ Graduation courses among Nautical Studies, Marine Engineering & Technology, and Naval Architecture. Merchant Navy is a high paying job.

Hi Amit, you may refer to the following listing for course options
https://arts.shiksha.com/arts-colleges-in-india-categorypage-9-32-1-0-0-1-1-2-none-1-0?
Please note that no course or college can guarantee 100% placement. You must academically outshine other candidates and must do well in the interview to be placed. Always follow your interest. Among the subjects you mentioned try to find out which is the one you like the most. Economics and Mathematics have plenty of scope. All the best.

.BFIA is specialised BBA with major electives in Finance & Investment Analysis. This degree prepare students to work in Financial Institutions.

Aeronautical Engineering overlaps 80% with Mechanical engineering. Mechanical Engineering graduates can easily get jobs in Aeronautical companies. Why do not you try joining Indian Air Force in Aeronautical Engineering ( Mechanical) technical branch as a Commissioned officer.

Being from Science it might have been difficult to clear any commerce based course. You can apply for B.Sc, BCA, BBA etc or try Your hand on CA/CS/Icwa.

Which CET ?

It some what's depends on you choice and what subjects you opted in 12th. Science or commerce or arts. After this only further suggestions can be provided

According to me Computer Science is a stream of engineering and software engineering is one of the opened paths after computer Science engineering.