Calculus II over the summer

Hi everyone,

Background: Currently a junior in hs, taking AP Calculus AB and acing it.
I was wondering if I should take Calculus II over the summer on BYU. I know some schools make you do AB before BC, but my school offers it as either/or. If I were to take BC senior year, I would end up repeating a lot of material. And the problem is there is no other course for people who take AB junior year, its either BC or Stats, while kids who took BC get to take Multivariable senior year. I would like to do that too, but I heard Calc II is a lot harder than Calc I or BC, and I worry taking it over the summer would be too much. What do you guys think, should I do the summer course, self study for the BC exam during the school year, or screw it and just do BC/Stats/CompSci? Thanks.