虽然是说四年，但是你看一下就知道这其实只是对具体课程的要求。从事实上来说，没有calc BC根本就不用考虑了。

*Four years of mathematics should include at least algebra, geometry, trigonometry, analytic geometry, elementary functions as well as pre-calculus. Advanced mathematics courses are encouraged.

建议你们和高中讨论一下，看最后两年学校能不能接受网课或者大学课的credit.