If you want to be a Biological Scientist then you need to study Physics, Chemistry & Biology course in your 10+2 and then you have to follow the science courses related to Biology such as Microbiology, Zoology, Botany, Genetics etc. But once you go to higher studies, the use of mathematical tools like Statistics, Arithmetic and Algebra will be required. So if you don't want to study Mathematics, don't do it, but make sure that you must have a good mathematical conception till your 10th atleast and the else required, you will carry on from your curriculum.

For more information regarding the career after PCB consider the link below:

https://school.careers360.com/articles/courses-after-12th-pcb

I hope this helps. Wish you a great day!