This seems like a potentially good first step in trying to counter wealthy people's gaming of the system with SAT "prep" and the like.
This is actually a serious question. I want to get an understanding of the mind-set that creates this class wedge.
I did not study for my SAT. I did not do great. A long time friend who I consider to be one of my intellectual peers, did study, got a great SAT score, went to college, worked the system and now we both work the same job. None of this is scientific, this is just my experience, however I have always had the feeling that people who excel at following the rules of schools obviously do better in that type of system.