Accounting & Commerce

Yes, you can but you have to appear for an entrance exam to do B.Com as well. If you are in class 12th then study well, achieve a good score and then think about which field you should prefer.

Don't do it through correspondence, do it in distance mode. It will be a value addition. It is definitely beneficial.

Marks scored in graduation are considered to apply for B.Ed, not Master's degree. 50% for general category and 45% for reserved category. So, you are not eligible for B.Ed.

Yes, you can pursue MBA directly after qualify GMAT.

Yes, you can get admission.

There is no additional course which needs to be done along with B.Com to pursue MBA. You just need to prepare for MBA entrance exams. As you said, if you want to shine in the field you are dreaming about. You can take up a certificate and short-time distance courses in that and once you complete it,

Do you have any specific field of interest like Sales and Marketing, HR or Revenue Management?

Dear,
Commercial mathematics is very simple, you shouldn't worry about that. Now, taking into account the CBCS syllabus, mathematics is compulsory.