The 10% came about because so many kids are in TX applying to TX and A&M... but
it has not been without contraversy. There are kids from the top high schools that have a hard time being in the top 25% of their class, but would be tops in bad high schools. Yet the top 10% of the bad high schools get in, and the 25% kid gets in very good private schools because of SAT score. The top 10% rule does not mean it is truly the top 10% of students overall. Secondly, it has had some other unintended consequeces. For example, if I graduated from TX but I know my kid has no chance at getting in, do I continue to donate big bucks to the school? Probably not. There are a lot of first generation grads in the big TX schools now (especially UT) that don't have huge ties to the university, while a lot of old alums kids are going to TCU, Baylor, LSU, Oklahoma, etc. I am friends with some UT grads that have told me they are seeing a dropoff in contributions from the newer classes coming from this rule, because the students do not have the long term ties to the university (not that Tex. misses the money).