Science

The first point is your interest. If you like to study Chemistry or Microbiology, because both subject have wide scope in different fields like Pharmaceuticals, Chemicals, Fertilisers etc.

The fees for M.Sc in IIT various from subject of specialization. Fees also varies from different IIT's. IIT Delhi has different fees, then IIT-Bombay, IIT-Rourkey, IIT-Madras, etc.

No, you cannot change university.
You can change when you complete your Bachelor’s degree.

Yes, you have good result. You are eligible.

It may be different.
Definitely, there is concession for SC candidates.
And, there are lots of government profit for SC candidates. So, don't worry move on.

Hi Supriya, you cannot give IISER until and unless you are in your 3rd year. So, in order to apply for IISER exam, you must be in your final year then only you can apply. Hope this helps you. Best of luck.

No, it is not a compulsory section, but It is preferred if you attempt that section as well. As it will add to your scores. As most of the questions in aptitude exam are basic ones 10+1 and 10+2 biology NCERT books are more than enough. Thanks.

Freshers get around 15k to 20k. After that, it increases as you gain experience.

Hi Melvin,
Here's the information you are looking for:
https://www.google.co.in/amp/s/www.shiksha.com/college/amp/southern-academy-of-maritime-studies-royapuram-chennai-35414

10th pass is the eligibility for the diploma.