Do physics! Especially if your main reason for wanting biology is that it would help with medicine/pharmacy, because biol isn't just the human body, it's also plants, ecosystems, animals, all sorts of things... If you're interested in maths, then I so recommend physics (yes I am on a huge physics high at the moment...I love it so much right now...
![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
). Someone else said it, that everything in physics leads on to another and everything interrelates, while biol is just memorising *really* long names and yeah... (yes I am on a huge biology low at the moment...man I hate plant physiology!)
So yeah, there's my slightly biased opinion...