I think you're right, but with two caveats. First, students with shockingly blue blood tend to keep company with other upper-crusters, frequently in exclusive fraternities or sororities that seek to carve out new depths of exclusivity in an already exclusive environment. This makes them less obviously evident than people expect. Second, I would caution that you, too, are more likely the exception to the rule. The unfortunate fact is that most kids who get into prestigious schools have had the benefit of extensive preparation while the students who lack this preparation have very poor chances. Sometimes you can outwit the test with a massive intellect or a knack for test-taking, but those sometimes are seldom. I salute your seldomness, although a bit sadly. :)