I was held back in Kindergarten, so I suppose this is an F. In college, I covered the entire spectrum from D- to A- (no clear A's). In graduate school I earned about 2/3 A's and 1/3 B's. In various courses as an unenrolled student at the grad level I earned a B+, two Bs (in one case the Professor told me he reported a B- and then changed his mind to a B. I went back to him to make sure this was not a mistake. He told me it was no mistake. That is the first time that happened. Usually when a professor reports the low grade to the student, and the student accepts it, he has no reason to change it. I was not in the program so I did not need the grade anyway, it was just for enrichment. This is the first time that happened.), two more B-'s (one; a course I had to take at work, and one a summer course I did not need) and one C-. I suppose I covered the entire spectrum.