I have two potential letters, but I don’t know if they will add much value to my app:
The first is from my research mentor, who I spent 6 weeks with during a summer internship. He asked for a draft letter for the supplemental, in which I included my experience in the lab and info on my ECs. He only spoke to me for like 5-10 minutes a day for during my 6 weeks. He also taught me many other data-gathering methods. However, he was clearly more interested in his writing papers for his research grant and didn’t really pay much attention to me other than that as a result.
I also went to Harvard Summer School, and I did well (got a 99) in my class. I participated and emailed my prof a lot throughout the class, and my professor said he writes recs for the top 5 kids in the class, so I got one. However, he made a point of saying it will be short. In addition, I am also planning on majoring in the subject that I took at Harvard at MIT.
Thanks!