Imo I remember it very well. At least conceptually. History is the hardest. I took 11 AP tests, 3 of them without taking the class over two years. My teachers

Imo I remember it very well. At least conceptually. History is the hardest. I took 11 AP tests, 3 of them without taking the class over two years. My teachers were generally not PhDs but think these classes were better than my undergrad classes. I suspect you are right on the hard science assessment. Those do require simply memorizing many facts. I avoided those classes.