Accounting & Commerce

It is a better choice to pursue commerce with mathematics, so you can get a better understanding of the BBA course in future along with a wide range of options. But, BBA is a great field to pursue higher studies.
You can consider the below mentioned colleges:
1. IP University – Delhi.
2. Symbiosis – P

I guess you are confused with too many courses in mind.
Have some patience and focus on one course at a time. If you wish to pursue CFA / FRM, please focus on it instead of CA and vice-versa. Doing too many courses simultaneously can be a risky affair.

You can take NET or SET exam and pursue Ph.D in order to make a good career after completing M.Com.

The path you need to follow is:
1. Common Proficiency Test after 10+2.
2. Integrated Professional Competence Course.
3. Three years Article-ship / Training under a practicing Chartered Accountant.
4. CA Final.
Take coaching for CPT to clear it well. Rest of the information is at www.icai.org.

Not relevant as IT is purely technical and needs strong basic concepts in the field of coding and technology, you must go for marketing or finance or human resources.

B.Com is a degree course and CA is certificate course, you can Pursue being a CA even after Graduation, so keep trying, CA holds good value in market and has decent opportunities.