B.Sc Maths

Hi Jini,
Any graduation degree holder is eligible for CAT.
After qualifying CAT, you can get admission in IIM.
All the best.

First, they will check your PCM score and then English will be included as well.

You need to do Diploma through distance because our education system doesn't allow to do 2 regular courses simultaneously.
Check out the distance course availability in this college.

You have various options to opt for:
1. Actuarial Sciences
2. MBA
3. GMAT
4. GRE
5. Banking and finance
6. Data Analyst

If you really are into mathematics and want to study further then only you should for M.Sc. And if believe in entering the real world and want to look for a job and earn by yourself then I would say banking and finance is better.

The fees structure for B.Sc maths varies from university to university and from college to college. For exmaple the fees for B.Sc mathematics in different colleges of Delhi University in North Campus varies from 13000-20000 whereas the fees for some colleges in South Campus or off campus colleges is around 7000.

No. The answer is obviously a no. You'll have to start from the very starting.

Did you mean you want to pursue Maths (Hons) in post graduation? If yes, then you will have to appear for entrance test of every government institute you want to take admission in. If you want to go in IIT you will have to appear for IIT JAM. If you want to go fir research in your subject along with post graduation you can apply for TIFR. For private colleges, there arena't any entrance tests.