It seems that schools, at least the upper tier ones, prefer students from name brand schools as opposed to great numbers....provided, of course, that the Ivy students have reasonable credentials. anyone else notice this pattern?

they also seem to select students from about the same schools over a 3-5 year period as opposed to selecting students broadly from the various schools, i.e. school A chooses its students from schools A,B,C and D consistently, and only occasionally from the rest of the alphabet.