CS -> Pre-med major switch = possible?

But, there is a responsibility to do your due diligence. Any OP is the one who will apply. We do answer questions to clarify, to help fine tune, offer a different perspective, etc. But that presumes the OP (student or parent) has pursued some of the basic info, from the right sources.

OP named some tough colleges to get into, assuming the prestige is what matters. But when his full app picture is pulled together, next fall, he may or may not even be a match to those, to what they look for, for their undergrad class. First things first.