Congratulations on your son's acceptance to Yale. We have a local friend who was accepted EA and plans to attend this fall as well. My own DYS attends a high school where students matriculate to that university in above average numbers (lots of students are children of faculty and/or alumni). So I can attest that your son will be in good company and I wish him lots of luck there.

Many thanks for your detailed response. I have tried to emphasize the importance of EC's to my DYS and he is just now starting to get it. I'm sure your book recommendation will be very useful to him!