Hi Ishaan.

Great that you wish to be a cadet officer in merchant navy.Merchant Navy, as the name suggests is the term is the term for commercial marine services.The commercial naval activities in India include shipping of cargo and people across various destination of the world.If you love to travel then it is a great job for you as you'll be travelling around the world for the completion of your task.

To join merchant navy you have to appear Indian Maritime University examination which is known as IMU CET.The IMU CET is conducted around 1st week of June.There are many other colleges for which can be considered which include :

1)Tolani Maritime University

2)International Maritime Institute

3)B.P.Maritime University.

4)TMS Chanakya

5)NMA Chennai

The last two colleges accept JEE scores as well.All the colleges accept IMU CET scores.Tolani conducts its own examination.You can appear for AIMNET as well.

Attaching some links for your detailed knowledge

1)http://aimnet.net.in/

2)https://university.careers360.com/articles/merchant-navy