Science

Where do you wish to apply? Exams which are conducted for M.Sc are BITSAT, IIT JAM and IPU CET.

You can get in touch with them directly as the information is not given on the official website https://www.jdbikolkata.in/contact.php

I could find around 8 distance colleges in India that offer M.Sc. In Environment. To know how to apply, please click the link and select the college (s)-
https://www.shiksha.com/science/colleges/distance-correspondence-m-sc-colleges-india.

The field for both of these streams are growing in India. Every course is equally good and important. Go ahead with the course in which you have interest.

Yes, you can apply as there is no cut-off mentioned by the college.

To know the criteria for admission in IISER, please check the below link- https://www.iiseradmission.in/?page_id=8.

If you fall in the below criteria, you are eligible to give NEST:
1. You must pass class 12th or any equivalent examination from a recognized Board in 2015 or 2016.
2. Students who appeared for their 12th Examination in 2019, are also eligible to apply for NEST 2019.
3. You should have studied Science