B.Sc

Mathematics is a universal subject. If you choose to pursue Mathematics, there will be a lot many options that you will be able to chose from. You can work in different areas such as:
Mathematician - You can choose to pursue research (become a scientist) in your area of interest in Maths. And if you choose research, you can go into the teaching sector also. Check out institutes like TIFR Mumbai, IMSc Chennai, Harish Chandra Research Institute Allahabad. Chartered Accountancy - If you like auditing, taxes and accounting, you can think of preparing for CA too. Banking - Banking is another sector that you can GET into with Mathematics. Actuarial Sciences - If you love data and maths, actuarial sciences would be a great field for it. Data Analysis/Operations Analysis/Project Development - If you want to work in the private sector, you can look at these profiles.

I'm a graduate of BIT (Noida extension center) for BAM (B.Sc Animation and Multimedia) Batch of 2009, and think I can give you some insight.
If you wish to enter a field of animation, design, or film production, the course is structured in a way to expose you to the various disciplines from across the field. It's a glimpse into the insides, and nothing more. This does not mean that the course is bad. As far as foundation studies goes, it is quite strong and very methodical. But, majority of my batch-mates, (and future batches as well, as my faculty tells me) join these courses expecting them to be vocational, to get jobs the moment you leave their gates.
If you are assuming the same, don't expect the scope to be too great unless you have exceptional talents or exceptional insights. Majority of the students freelance, but don't earn much in the first few years out of college. For those who get jobs, average salary is about INR 15K out of the gate.
On the other hand, if you are great at research, or develop your skills like crazy, the sky is the limit. I know a fellow batch-mate with crazy drawing skills, got INR 30K on placement, and by the second year was getting around 65K per month because of his skills and insight.
Lastly, know that you will have to choose a major in the final year. Be prepared from Day 1 for that, and study as much as you can on your major topic from the net or from books. In our line of work, the best learning comes from experience, so make sure you do a lot of summer internships and trainings to maximize your scope post-graduation.