<p>In this case, I was talking to OP specifically. Since OP feels shaky about this math skills and is getting a B in AP calc AB, it’s a good idea to retake Calculus. Most of it will be a review, certainly, but it’ll ensure his knowledge is A-Level for the next class. This a foundation class for Engineering. In addition, by being a bit easier than his other engineering classes, OP is likely to feel more confidence generally speaking.</p>