Eh, if you're just auditing the class, maybe. When I was in college they made me retake ridiculous prereqs for the most trivial of reasons every time I transferred, allowed no exceptions to these, and personal requests to professors to get out of them were completely ignored. The prereqs were enforced by the computerized registration system - good luck getting past them without a waiver.

As one anecdote, they once told me I needed to retake intro physics. On the pretest given on the first day of class, I came within one problem of a perfect score. Didn't make a lick of difference - their syllabus differed from the last university in the most minor of ways, and despite the fact that the class never actually covered even 50% of the stuff it claimed to on the syllabus, I was made to retake the entire sequence anyway.