6.041 Probabilistic Systems Analysis is a Course 6 EECS, but more of a Math class, I took with Prof. Tsitsiklis at MIT as a Sophomore fall semester.
I had a lot of trouble in the class. I really worked hard, but I ultimately did not know what I was doing for a lot of the class. Lecture notes, recitations, and tutorials should be reliable. (Unless I was trying to simply for note taking and made the wrong simplifications) But I would not look at my homework. The textbook was certainly helpful, but a lot of it went over my head. It closely tracked the class, as it was written by the professors.