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<p>Assuming a school other than one like Caltech or Harvey Mudd (where “frosh calculus” is more like real analysis), that seems to be more like a tuition maximization motive on the part of the school, since many (though not all) students coming from high school AP calculus are ready to go on to the next level of math in college, rather than waste time and tuition repeating what they already know.</p>