Sorry, but that’s why selective colleges like AP tests – as they are a national yardstick for how well you have absorbed the information in a rigorous class taught across state lines AND how well your high school has prepared you for the exam. FWIW: Every student I know who has been accepted to HYPSM has scored a 4 or 5 on their AP exams. Unfortunately scoring a 3 (or 2) is just NOT a competitive score.
If you have achieved those AP scores with an ‘A’ or a ‘B’ in the classes, that is a “red flag” as Admission will most likely think your high school has grade inflation.
I’ve posted this in the past, but I think it bears repeating: