Hello

That depends on your lucking brother. Even BSC biotech and BSc microbiology this branches are placed and at the same time even BSc computer science has a great placement. You decide whether you like and want to pursue biology in future or maths. If I were at your place, I would have gone for Computer Science. Reason no 1) I like maths and no 2) Computer Science is a day by day upcoming branch and has a great scope in future since it teaches you different coding languages like Java, Python, C, C++ which you may enjoy as your career. 

The decision of choosing is with you. But believe me if you are not good with maths, logics, digital system, etc. Then do not opt CS and go for BSc is non medical field. I'll suggest BSC biotech to you if not BSC computer science.