"如果申請T20，AP不能抵學分" is wrong. mit stanford

https://firstyear.mit.edu/academics-exploration/ap-transfer-credit/advanced-placement/

A score of 5 on both Physics C exams—Mechanics and Electricity & Magnetism—will grant you credit for 8.01. No credit will be given for the Physics 1 and 2 exams.

 

https://studentservices.stanford.edu/my-academics/earn-my-degree/undergraduate-degree-progress/test-transfer-credit/external-test-0