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If you want to finish a science degree in college in four years, it's necessary.

That was the reason I thought of, but should we really act like all high school students must be prepared to major in science?

I think my DH retook calc in college, despite having taken in HS (he took it in 11th grade because he had been individually accelerated). He majored in science. Of course, this was decades ago. And I may be incorrect--maybe it was multivariate calc or something.