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There are two streams in merchant navy: navigation and engineering. To be a navigating officer, you have to complete a three-year course and to be a marine engineer it's a four-year B.Tech/BE course. Now some pointers about life at sea.
The salary and benefits are excellent but in the initial years, you have to stay at sea for 5 months and then you get a 2-month leave. Senior officers/engineers have to stay in the sea for less. Now if you are really serious about joining the merchant Navy, you should research about the life at sea, you could watch documentaries on youtube about their lives. Only if you are convinced, you should opt for Merchant navy directly after 12th. Another way is to pursue a mechanical engineering course for 4 years. After that, you can do a one-year pre-sea course (http://www.grse.nic.in/page_company-product.php?page_id=83) and gain entry into the merchant navy. This second route has two advantages. You have 4 years to think about your career choice, and you have other options always open as a mechanical engineer.

Aeronautical science is the science of flight and it relates to design and development of aircraft and its related systems. It is not offered as a subject in graduation level. Majority of institutes offer aeronautical engineering or aerospace engineering courses after class 12th for science students with PCM subjects.
B.Tech in aeronautical engineering prepare students in designing and building aircraft and spacecraft. Aeronautical engineers handle design, manufacturing and maintenance of aircraft, helicopters and UAV. There are lots of good career opportunities on completion of aeronautical engineering.
You can join:
1. DRDO.
2. ISRO.
3. Airlines.
4. Air Force.
5. Educational institutes.
6. R&D units, etc.
You have following options to become aeronautical engineer:
I. B.Tech in aeronautical engineering after class 12th with PCM. You can refer to following link for list of engineering colleges offering aeronautical engineering:
https://www.shiksha.com/top-aeronautical-engineering-colleges-in-india-rankingpage-49-2-0-0-0
II. Aeronautical engineering is an interdisciplinary degree. You can do M.Tech in aeronautical engineering after B.Tech in mechanical or electronics.
III. You can join Aeronautical Society of India (AeSI). The AeSI is a professional body, devoted to advancement of aeronautical sciences and engineering in India. The AeSI conducts associate membership examination, twice a year.
In this, the applicant has to clear minimum 10 level of section - A and 10 level of section - B with training, internship and projects of this examination, which is recognized by the Ministry of Education, at par with a Bachelor’s degree (B.Tech) in aerospace engineering.