Does commerce with maths group (12th) have greater course opportunities than commerce without maths?

There is nothing as such but mathematics will play an integral role if you choose to enter the finance field in future.

You will get access to almost all the colleges with commerce and maths after class 12th for B.Com. Though many have their entrance exams. There is a course called business maths, check it out if it is available in your city's school. It is the best option for commerce students, but if you are unable