<p>I'm planning to write a letter to the school because Upenn is my top choice. I'm on the SEAS waitlist. So I'm planning to include my community service hours which i didn't quite emphasize on my initial app (over 2300 hours), my interest in specific programs, and how i can contribute to the school (don't know what I'm going to specifically talk about with that one). What else should I include? How should I format it too?</p>