My college roomate (from Sri Lanka) would respect this question!!! The "test-are-biased-whites-argument" drove him nuts (1600 on the old SAT).
The old accounting trick is in play here....now you see it...now you don't! Figures lie, and liars figure, so what else is new? It costs much more to send them to school but the end result is a joke on the taxpayers, and we wind up with really stupid kids as a result.