I actually took 1LS3 Math and Econ for the purpose of boosting my marks. ( i hope to switch programs to health sci by 2nd year *fingers crossed* and they require a fairly high CA ) but if that doesn't work out for me, my resort would be to do Honours BioChem.
are you strong in Physics? I really suggest we all become virtual friends this way we atleast have more resources and help before September and during the school year