Science

Yes, for doing Honours degree, you have to have maths in your school during 12th class. It's prevailing for both B.Com and economics Honours.

Depends on the institute in which you are going. But majority of institute conduct their entrance.

No, every university has its own different norms. Maths is not required by many universities but some of the institutions can have maths subject in B.Com.
You must have the basic knowledge of mathematics (up to class 10th or 12th).
So, you can easily crack or clear the exam.

Hi,
Some colleges details are given in below link:
https://www.shiksha.com/science/colleges/b-sc-bioinformatics-colleges-india
Hope this information will help you. Thanks!

It totally depends on your choice, if you want to go in technical field choose B.Tech, and if you want to go in other field, then you must choose B.Sc.

Hi Mithuna,
Yes, there is gain in doing M.Sc in IIT. It opens up more job and fellowship opportunities for after M.Sc, as government provides many fellowship schemes to students who have studied in IIT. Good luck.

Give your exam details properly. You have provided innsufficient data.

Yes, you can get, but there will be no benefit of doing class 12th, as it will only be considered on class 10th basis.