Science

Hi Tapan!
Unfortunately No. You cannot apply for M.Sc in Mathematics if you have not pursued a bachelors degree.

Hello Sachin, Aah! Geography versus economics! I would like to advise you that please select the subject that is the closest to your heart. In both these subjects, there is enough scope for research. So do not worry from that perspective. Best wishes.

For admission in this college, you need to have passed 12th with minimum 50% marks.

Your combination is really good and unique but to get a good job you have to have the uniqueness in you and gather whatever knowledge you could because jobs especially in these fields are based on your knowledge and ability to perform tasks not based on your CV.

To pursue B.Sc Mathematics, you had to complete and pass in class 12. Many private colleges offer this particular course for students who have scored above 55%. You can go through the Shiksha website to get a reputed private college.

Yes, you can do that.

Germany is inexpensive and you can get many scholarship available. UK and USA are expensive but getting a scholarship is useful.

The list will be out probably by July end. I would request you to contact the college officials to know the exact dates.
Link: https://www.suniv.ac.in/page.php?page=our-contacts

Department is quite okay. No, the level is very less as compared to IIT.