India

Allthough Indian Flying Schools are good to become Commercial Pilot, if you can afford you may prefer CP license from Flying School in USA for better employability.

Can you specify the medical subject in which you want to become a teacher?

You can refer to the below mentioned for the ranking of MBA colleges in Uttarakhand:
https://www.shiksha.com/mba/ranking/top-mba-colleges-uttarakhand/2-0-133-0-0

You can evaluate:
1. Delhi University.
2. GGSIP University.
3. DTU.
4. IGDTU.
5. IGNOU and
6. Amity University for MCA.

KEAT exam conducted by Kerala State Government.

Most of the government universities in all states offering Masters in environmental science. Some universities offer admission through entrance exam and few offers seats through counselling based on their graduation merit.
Marine ecology is available in Marine Science College - Goa.

Master's degree in microbiology from a reputed institute provides excellent job opportunities in many industries. You can try for government jobs also.
Foreign countries have very lucrative job offers than India such as:
1. Brewery Industry.
2. Dairy and food products industry.
3. Research oriented laboratories, etc.

You need above 2 year of work experience will give you a good chances to get a call from IIM's. Anything above 4 years of work experience will give you less points. So, 2 to 3 year of work experience will be safe for you to get a call from IIM's, provided you have a good score in CAT and above average profile.