As per the general eligibility criteria fir BSc Nursing you need to pass 10+2 with atleast 50% marks and Physics, Chemistry and Biology as compulsory subjects.

As you say Mathematics students which you imply that you belong to PCM group and without Biology then you aren't eligible for the course.

To know more about BSc Nursing visit the link below:

https://www.careers360.com/courses/b-sc-nursing

I hope my answer helps. All the very best for your future endeavors!