Science

JEE preparation in one month is only possible if you're really good with your core concepts and also quick in solving problems.

Hello,
Thanks for Asking.
Yes, you can pursue M.Sc. after completing B.Sc.
If you dream for a good job after M.Sc, then you can do it from a well known university, IIT's or IISC.
To pursue M.Sc. from IIT's , you have to clear entrance exams - IIT JAM.
If you have any doubt about IIT JAM, then checkout - http://entranceexaminformation.blogspot.com/2016/07/iit-jam-entrance-test-queries-most.html
I hope it will help you.
Best of Luck.

tell me what you actually want to do or tell about your interest.

both are reputed. its difficult to compare each other.

if you have math in your graduation level then only you have a chance.

First mention the subject in which you are most interested.

Abdur Rehman University is better.