I was fine with the grad school courses, just not what followed. The courses were decent, and we had a grading system that was H P L F, and you had to really mess up to get an L or F, and they didn't award Hs (High Pass), and we didn't have GPAs anywhere. You just got a P for every course and moved on. I had to adjust to semesters instead of quarters.
We had one course, first semester, called "Bonding", and I swear I did not understand anything at all, in the class, or in the book. I figured I was toast, and the first test came and I did poorly, very poorly, but somehow had the 3rd highest grade in the class. I realized nobody else understood it either. I don't know why it was being taught at that level, none of us were prepared for it. The book was awful.
I basically figured out how to work the problems without having any clue what was behind the problems. P.