NYU and BC rejects. Both schools have much lower acceptance rates than BU, are recognized as more prestigious, and get more individual persons into good graduate programs, which is sad since BC is a fraction of the size of BU. Recognized nationally in sciences and math as much less prestitious and difficult than Harvard, MIT, Tufts, and BC.
The Wall Street Journal ranks numerous schools-- sometimes schools with less than 10% of BU's student body-- higher than Boston University in terms of ability to get kids into good medical, law, and graduate programs. See Wall Street Journal Feeder school rankings.