Science

To increase your chances you must take the english proficiency test TOEFL or IELTS with 6.5 score. The qualification otherwise looks good.

Hello Dear,
B-School means Business School where MBA and PGDM courses are being offered.

Yes, you can do it, but according to your Bachelor's degree M.Sc in maths is not a good option. If you want to pursue your Masters, then you can opt for M.Tech in your field which will provide your better career. All the states conduct entrance exam for M.Sc, you can visit their websites according to your favorable state.

Yes, it is a good career option if you are really passionate about it. It involves knowledge of History, Anthropology and such similar subjects. It is meant for a person who has the patience and knowledge for doing research. If you are good, then you may be employed in museums or government departments.

Hello Sonam,
Yes, you can apply for M.Sc after completing your B.Sc from IGNOU.

As mentioned in the above answer you can pursue M.Sc. You are already in the same stream.

Hello,
Yes you are eligible to do a Masters course in regional planning. Here are a few suggested universities which offer this course.
1. CEPT University, Ahmadabad, Gujarat.
2. Gautama Buddha University, Uttar pradesh.
3. NIT Patna
All the best.