CA

It depends on your interest. You can either go for IAS/ IES exams like UPSC/ SSC. You can also go for MBA entrance, but MBA is getting common among students and it is on saturation now. You can also try for LLB. Generally, students after completing CA/ CS go for jobs. If you have interest in law, then it is a good option.

First, you should concentrate on your class 12th board studies and register yourself with ICAI. If your foundation in maths and accounting is strong then you can easily qualify the examination for CA after completing 12th.
All the best.

If you are interested to pursue MBA from IIM, then there is an IPM course available at IIM - Indore for which you need to appear for an entrance exam. In this program, you will complete your graduation as well as MBA from IIM - Indore itself.

You can pursue CA after completing class 12th. There are two ways to pursue CA:
1. After completing class 12th, you can appear for CPT exam.
2. After completing graduation, you can skip CPT exam and directly appear for IPCC exam.

There are no colleges for CA as it is a professional course, which can be done after studying from the material given by the Institute of Chartered Accountants of India. You can register for the examination and you can join any coaching institute.

CA is about managing business accounts and CS is about managing business backend of administration and official documentation.

Yes, you can do it and give some mock test which is in April.

Yes, you can pursue B.Com while trying for CA. It will help you with your career.