Math for wharton

I am going to be taking pre-calc as a senior and I have heard that To get into Wharton, you should take Calc AB or BC in your senior year. However I have also heard that some kids get in without taking calc in high school and that those kids take math 103 at UPenn, which is the equivalent of calc AB I think. I just wanted to know if I should take pre-calc online over the summer and take calc during my senior year or take pre-calc during my senior and take calc BC in the summer at a local college or something

Some kids got in Wharton with different kinds of hooks. So it is hard to compare with them.

Wharton looks for:

a strong preparation in mathematics, particularly calculus

http://www.admissions.upenn.edu/apply/whatpennlooksfor/hsprep

They like applicants with strong math skills.