Can Senior Year Grades Drop After Being Acceptaned?

Hey, I got accepted to CS this year. I am a A-/A student taking two AP’s (Physics C and Calc AB). How much can my grades drop without my CS acceptance be revoked? Does Amherst even care, it’s a huge school, I can not imagine that they would notice. I give zero fucks about the classes I take (except for Calc AB I want the AP credit) and I want to spend my time learning some programming.