OK. but any more than 2 science classes in one year is just asking for trouble.
there is absolutely no truth to the thinking that too many kids believe-
“the students with the most AP’s win”
This is what Stanford says:
"We want to be clear that this is not a case of “whoever has the most APs wins.”
http://admission.stanford.edu/basics/selection/prepare.html
follow what they suggest as far as the classes and subjects, do well in class, participate in outside activities that genuinely interest you, and you will do fine. Burn out early because you took too many difficult classes per year in a faulty attempt to “impress” someone and you wont do so well.