Computer science is very easy when compared to biology. But if you have the Will power to study well, for your confused state of mind, I would suggest you to take bio with maths. Now you will have the choice of joining either medicine or engineering after you finish twelfth grade.
but if you have fixed your mind to study BSc physics, it doesn't really matter if u take bio or computer science . Only if you're in a dilemma between med or Engg choose bio with maths.