I want to study nursing. Will they accept me if I have a low grade in Math and Biology?

You may be put on a wait list. I would suggest retaking those classes if you received less than a B, since, for me,acceptance was based on a weighted scale. Therefore, the better your grades the better your chances of being accepted.
In addition, the college I attended required us to maintain a B average throughout the program.

If you have C's you may have an outside chance, but Nursing Schools look for students who are good in sciences. Would you consider summer school to repeat these classes and improve your grades? Bio and math are two of the really important classes schools look at since you will be dealing iwth your patients' biology and need math for safe medication calculations. If you are not truly interested in science you might consider another major.

Nope.