In my country, around the same time top public universities adopted affirmative-action quotas, they also stablished a "pre-calculus" summer course, to get everyone up to speed in all high-school math before starting their first semester (not specific for affirmative action students, plenty of non-AA students also had some catching up to do). From what I've heard it worked very well as an equalizer, with AA students who entered with lower test scores, ending up with final scores mixed with every one else.
