Which undergraduate college is the best?

About half the people who apply to medical school get in somewhere, and the majority of those students did not attend ivy league schools. You can do premed at any 4-year college or university. Not really sure how you decided you have an 80% chance of getting into a top school, but you're wrong. You have average grades and test scores for an applicant to a top school, which makes your chances more like 10%. If you live in PA, you have a good shot at Penn State. Otherwise, maybe not. Harvard isn't the most expensive of those. You have a lot more research to do.