Political Science

Student comes to Tata Institute of Social Sciences for doing M.phil/P.hd. Sorry to say I don't have much idea about it. If you want to see criteria for same in TISS go through the below link. https://admissions.tiss.edu/admissions/mphilphd/programmes/.

The admission procedure to UG courses (which includes Political Science) will start in the month of April which is purely based on merit, i.e., your performance in board exams in class 12th. There is a separate cut off for each college and no entrance test is held.

You should buy a book of Shafique for political science and you will get at Jamia Maktaba.

Yes, then can go for it.

According to previous years cut-off, your percentage should be more than 70.

You can prepare through the book of Shafique & you will get it from Jamia Maktaba GATE No.04, Jamia Millia Islamia.

Yes, you are eligible, some of the great universities such as JNU (Jawaharlal Nehru University) offers this program. JNU is among most prestigious university in India. You can go with through this link
https://www.google.com/amp/s/www.shiksha.com/humanities-social-sciences/political-science/course/am

age limit not more than 21 years

India-
Presidency College
Madras Christian College
Jain University
Dav College
Mount Carmel College
ABVHV, Bhopal abroad
Could you please tell which country are you interested to study in?