To be eligible for B.Com (//B.Com) Hons you have to pursue Mathematics in your 10+2 and thats the only way you will be eligible for the course. In case of B.Com (//B.Com) General you will not need any Mathematics  in 10+2.

You can visit the link below to know more about BCom Hons:

https://www.careers360.com/courses/b-com-bachelor-of-commerce

I hope this might help. All the very best for your future endeavors!