<p>Need more info on APs, since I am an Int'l student. I have applied as Fall applicant, engineering (mechanical); what should be the preferred APs (esp where credits are given by Yale, Stanford, Princeton, Upenn) one could take in May '09. I was looking at calculus BC, Physics C and Chem. i am not sure if I can take all--may leave Chem. Need to register asap.</p>