I'm writing a statement of purpose nowadays for my intended linguistics MA program. The first draft is about to end, which I will edit harshly later.
What I'm curious about is this. When I was a sophomore student, there was a must course that I was much more successful than the the rest of the class. When the results of the first midterm were announced, a good number of people in the class withdrew from this course, while I got the highest grade. Mine was 27 out of 30 and the class average was around 15. Moreover, many people who didn't withdraw failed afterwards. In this way, I was the only student the course instructor calls by name during lectures. This professor now happens to be one of my recommendation letter writers and I reminded him about that when requesting the letter.
Should I mention this "achievement" in my statement of purpose or would it be irrelevant as the admissions expects us more than grades and being successful?