Hi aspirant,

You can become a Merchant Navy officer by appearing for IMUCET and taking admission in Marine colleges. The the basic eligibility for Diploma in nautical sciences is that you need to get sponsored by a shipping company that guarantees you work after completing your course. The examination for entry into DNS courses is done twice a year and you can have a go for it if you have completed your 12th from are recognised State/ Central board.

Hope it helps!!