<p>At least for math, I’m not so sure. According to the AP data tables provided by the college board, around 85,000 students took the AP calculus BC exam last year, qualifying them for multivariable calculus. Based upon the individual state reports I have seen, roughly 20% of the students in calculus BC took it in their junior year or earlier, suggesting a market of roughly 17,000 students for a sophomore level math class - considerably larger then, say, AP Japanese, which only had around 2000 test takers last year.</p>
<p>Oh, and trust me - taking classes at a local university is a massive pain.</p>