It sounds like your son is interested in Carleton, and if so, that’s where he should apply ED. These are all great schools, and he stands the best chance at getting into a top medical school if he’s thriving in the college of his choice. I recommend he look at the courses offered by each school in his intended major. That will help narrow the choices down. I also recommend he look at the student newspaper of each school because it will give him a feel for the culture. Best of luck!