Of course some people do great without studying. I got a perfect score cold, FWIW (~nothing). However, the population of people with great scores also include

Of course some people do great without studying. I got a perfect score cold, FWIW (~nothing). However, the population of people with great scores also includes a disproportionate number of fairly smart kids whose parents are able to shell out big money for private school and test prep, and those students are a private college's bread and butter. If the schools happen to also pick up some poorer but equally good at test taking students in that population as well, so much the better.