If you want to go to medical school, you should realize that you need to earn all or nearly all A grades (and note that A- is counted worse than A for pre-med purposes) to have a reasonable chance of medical school admission. If you go to UPenn, this will be in competition with 100% students at a “top 20” university, rather than just 30-40% of students at your high school who will go to a “top 20” university.