I think most colleges these days require students to take a math placement exam, many also require a foreign language placement exam if the student has foreign language credits and plans to take such classes in college as a continuation. This would seem the logical way to determine if the AP or college credit class attempting to be transferred should be accepted.

Many colleges are cutting back on what they'll allowed to transfer, they're also demanding higher AP test scores in order to be transferred. Likely colleges are feeling the funding crunch too, less classes taken means money out of their pocket.