Why are AP scores so undervalued?

@IN4655 I should clarify my point … Many students are in a similar financial/school position, and so apples can be compared to apples, and then AP scores are a great measure of comparative academic ability. In that context I’m confused why schools would not look at them (the real results and not just the self-reported scores). Otherwise I agree with what you’ve written, including probably about IB, though I’m much less familiar with IB and its testing.