What else is he taking? Is he taking AP Physics C? If so, he’ll still be using the Calculus he learned in BC, so I wouldn’t worry about "taking a year off. Either class will help prepare him for further study in college. It’s important to look at this decision in the context of the rest of his schedule. If he’s already taking AP English, an AP Science, and AP History, and maybe an AP Language, taking Stats might free up some of his time for those classes. Depending on his school, even if those reviewing his application are aware that the school offers MVC, unless the counselor marks something less than a most rigorous schedule, they may also assume that MVC didn’t fit his schedule. That’s not the type of class that will be offered 3 or 4 different times.