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Hi Krishna,
1)
There are many courses available. You must opt for a course / stream which matches your interest and skills as it will help you to achieve your long term career goal.
2)
As you have studied and shown interest in Biology in 12th, you may take up medicine, dentistry, agricultural science, dairy science or biological sciences (biochemistry, biotechnology). (ONLY if you fulfill the eligibility criteria).
* Apart from doing the degree level courses in Science with the conventional combinations you can also choose degree courses in several emerging professional areas such as physiotherapy, occupational therapy, nursing etc.
* You can also opt for courses outside the university stream such as hotel management, fashion technology, aircraft maintenance engineering, government accredited computer courses.
However, other than Science stream you may even explore the opportunities Commerce and Humanities offer.
3)
As for Biotechnology, it is a rewarding and promising career option.
- After completing the course, graduates can seek employment in chemical industries, agricultural sectors, pharmaceutical and manufacturing industries.
- Professionals in this career can also opt for teaching jobs in universities and colleges.
- Bio-technologists can seek employment in research laboratories, which are run by government or private sector.
- Professionals can seek job opportunities in private sectors such as food processing and agro-based industries, pharmaceutical farms and aquaculture.
- Environmental experts are also employed in different government agencies and private institutions.
- Bio-technologists can also opt for science writer in media houses.

Hi Sumit,
1)
To pursue Marine Engineering,
** You must complete 10+2 with at least 60% in Physics, Chemistry, Mathematics and English from a recognized board.
** You must clear detailed physical fitness and medical standards to qualify for admission.
2)
Some of the colleges offering marine engineering are :
-Marine Engineering Research Institute in West Bengal
-Marine Engineering & Research Institute in Maharashtra
-International Marine Communication Centre in Tamil Nadu
-Lal Bahadur Shastri College of Advanced Maritime Studies & Research in Maharashtra
-Indian Marine College in Andhra Pradesh
-Indian Institute of Technology in Maharashtra
-C.V. Raman college of engineering in Bhubaneshwar
For more, you may refer to the link mentioned below.
https://science.shiksha.com/be-marine-engineering-colleges-in-india-categorypage-2-62-1-0-0-1-1-2-0-none-1-0
While selecting the best college, you need to check some of the important parameters such as recognition, year of establishment, batch size, syllabus, faculty, fees, placements etc.
Hope it helps. Please feel free to revert. Click on the thumbs up or mark it as the best, if you found this useful.
Wish You Luck!