I thought this might be helpful to all the high school students. Below is a general list (to my knowledge feel free to contribute people) of all the major feeder colleges for the BBs:
I tried to order them..
Generally from my knowledge the major feeders are the following: Ivys, MIT, Williams, Amherst, Swarthmore, NYU, Northwestern, Chicago, Duke, Stanford, and Berkeley.
Notice that cities will often come into play. If you goto a good school but away from a major city, its harder to get a BB job.
I hoped this helped. Please contribute to the list as I'm sure there are some (and possibly many) errors.