St. Xavier's College, Mumbai

Yes, Xavier's has BA in political science and also the faculty is very good.

No, the admission process for BMS is most rigorous in St Xaviers. You need to appear for entrance, then if you clear it, there is an interview.
If you clear that you can get in.

Yes, there are some relaxation of 2.5%, if you are national level player.

Something between 97% to 98%, but nothing less than 96%
For general non Christian students.

As per my opinion there are limited seats in M.Sc, but it only depends on the college. Every college has different number of seats. If you can elaborate your question, then we will properly guide you. Hope for your best future.

B.Com is only offered in evening college, where a student is also employed part time or full time.
90% and above is considered good for it.

Yes, it does provide BA in English, but not honors.

St Xavier's, Mumbai offers B.Com only as an evening course which means you need to have a job for day time and then only you are eligible for it. As far as I know B.Com here isn't very great. You won't get a college life, as the evening college is kept separate form Xavier's usual curriculum.

St. Xavier's College, Mumbai is one of the best college to pursue economics. It only provides B.A in economics. Full as well as part majors in economics and statistics.
The criteria for admission is nothing expect the merit list. The percentage cut off for B.A economics ranges from 98%-96% for general non Christian students.