We all learn at different paces. And of course, no one is great at every single school subject. (Or if you're like me, you're okay at a subject depending on which teacher you get and how your brain functions at 8 in the morning). The Perfectionist doesn't see things in this manner. To them, if they teach the subject clearly, everyone should be able to understand it immediately and they become rather frustrated or just clearly annoyed when students can't do things correctly the first couple of times. (Or just struggle for the rest of the year). They tend to hold up the top student in class as a role model and are overly picky or overly preachy about their particular subject. In short, you're going to have quite the challenge getting a high mark in this teacher's class.