Hello Aspirant

I believe you are talking about the Merchant Navy as the Marines are in the USA, in India, we have the Indian Navy.

The qualifications required for the Indian Navy are that the candidate must have completed their 10th and 12th with a minimum of 50% aggregate in both and in 12th they must have Mathematics and Physics as their main subjects.

There are various posts in the Indian Navy, and depending on that post, the education qualification changes. For the post of a cook, mess boy, engine rating, or deck rating,  you just need to be 10th pass. For posts such as the Welder or Electrician, you need a degree in Engineering.

The age limit for all these posts is from 17.5 to 25, but for some, it is till the age of 27 (for cook, mess boy, helper, etc.)

Since they don't look at individual marks but as an aggregate, you should be able to apply for the Indian Navy.

Hope this helps