You can try the “C” but I don’t know if a summer calculus course will be sufficient math prep to ensure you do well in the class. Maybe someone with more experience can weigh in? There is no use in loading up on very difficult courses if you can’t do well in them - at our HS this is a the most difficult course - friend of DS22 (super smart kid) got a 32 on one of the exams (and these are kids taking AP Calc B/C concurrently). Not looking to dissuade you - just want to make sure you will have the proper math background to be successful in the class.