None of the following recommends retaking (non-honors) first semester calculus (Math 221) for students with a 4 or 5 on the AP calculus AB or BC exam:
https://www.math.wisc.edu/undergraduate/math-placement-tech-algorithm-uw-madison
https://www.math.wisc.edu/wiki/index.php/Overview_of_the_calculus_courses
https://www.math.wisc.edu/undergraduate/ap-creditshigh-school-coursestransfer