Formal Writing To Community How To Write A Letter About A Professor?

How to Write a Letter about a Professor? - formal writing to community

I just finished taking a math course at a community college. It was a very difficult class, and I struggled most of the time. However, it was the Math class first time that I actually got something. The class is the class of students who believe that "good class" easy classes "and therefore gave this teacher very cleverly composed. I feel bad, and I want a letter to Dean telling him how much of this Leave class. As I write this letter? "I want to the dean or what? Should I send an e-mail or mail? How formal should it be? Thanks