Devouree
Good names already taken.
As said before, keep bio until the start of yr 12 at least. Content wise, bio is really intensive. Chemistry can be learnt, but bio is more just memorising, memorising and yet more memorising. It's the most boring subject I have (including english which I eat and sleep in). But if you actually study = top marks in HSC. So whilst I probably will drop it (cause me =/= study), I suggest you should go on, at least until you get your half-yearly report and see how you did.