Accounting & Commerce

No, you need to complete B.Com then only you can opt for Master's degree (M.Com).

You can check link for NAAC A grade colleges: https://goo.gl/cqg2sK

Yes, you can do LLB course after B.com. The duration will be of 3 yrs.
The eligibility criteria for LLB course is that one should have B.A/ B.Sc/ B.Com degree with minimum 40% marks in aggregate for general category and 35% in aggregate for SC/ST students. But, you have to pass the entrance exam and

B.Com/BBA with not less than 45% marks in the aggregate.
Or
B.Com (Hons) degree with not less than 45% marks in the aggregate.
Or
A graduate with Honours in Economics / Mathematics / Statistics / Commerce, Computer Applications, Information Technology or Computer Sciences as a subject in the examinatio

Yes, you can join ICA for CIA (Certified Industrial Accountant) course after completing your 12th standard.
It is a Certification courses of 12 months.
Eligibility for ICA-CIA courses:
1. You should have passed 10+2 Examination from any recognized board.

Dear Chandan,
You will become a finance manager in a reputed business organisation. Consider all the top companies and apply for the same.
All the best.

Dear Akhil,
I am sure almost in India, if you want to pursue MBA course, you need to score a minimum of 50% marks in graduation. If you belong to the reserved category then 45% needed.
All the best.

Yes, definitely, you get admission in IIMs but first you have to get very good percentile in CAT, so that you become eligible for IIMs and complete the GD/WAT and PI rounds.
Best of luck.

Yes, you are eligible to pursue CA. You may apply through direct entry scheme.