<p>Tufts and Duke are two others that will accept ACT in place of SAT + subject tests. When my daughter was applying, our experience was that only a fairly small number of highly selective colleges and universities required subject tests at all (as intparent said), but that out of those schools, only a small subset (often, the most selective ones–Yale, Harvard and the like) would not take ACT in place of SAT + subject tests. YMMV. Of course, one does need to check the requirements of each college or university on its web site.</p>
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<p>This kind of depends on both your son’s score and the colleges and universities that he’s targeting. If your son has done well enough on the ACT for the colleges or universities he’s interested in, then maybe so. But some students do just score higher on SAT than on ACT. If you’re looking at colleges and universities that aren’t all that selective, then a good enough score is good enough, and there’s no need to worry about whether you should submit your 28 on the ACT or your 650/640/680 on the SAT. (Either of those scores is plenty good for most of the 2500+ four-year colleges and universities in the U.S.) But kids who want to get into Ivies or Amherst or Northwestern or MIT worry about these things a lot because admission is incredibly competitive and they really do need to show themselves to their best advantage.</p>