Letters of Rec advice
Hello everyone. I need advice on who to choose for my letters of rec. 4 people have already said yes to me. These 4 people are two optometrist (one I shadowed and one I currently work with), and two science professors (one Physics and one biology). In addition, I have 3 other people in mind who I have not asked yet but I am pretty confident would say yes. One is an ophthalmologist I shadowed last summer extensively, one is my student counselor program director (I was a student counselor for my last year and a half of university), and the other is the director of a volunteer summer program I have been attending for the past 4 years. I know I can only put 4 letters on my app, so who should I choose? I'm thinking maybe I should keep both optometrists, one professor, and then the last one I don't know who to choose. Also if anyone knows is I can send extra letters of rec directly to the schools please let me know.
Any help is much appreciated!