Hello,
I completed my graduation in maths but I am not satisfied with that course. I hardly completed that course because I am poor in maths and I didn't get good grades also, so from before I am always interested to study biology courses. Still I want to do, but in distance studies only. What course I can apply.
After my schooling I took wrong step that choosing computer science (vocational course), after that I can't choose any biology course, that's why I studied maths course. So now what will I do to study any biology course.

Why distance studies only? For biology, that is not good. You need to be in a classroom and also lab setting to learn the best way.