I was hoping someone could please explain to me why my teacher did this and what I should do about it. Today, we took an AP chemistry chapter test. I've been studying for the past week, and I was initially very very happy with the grade I received. I got an 86%, which compared to the rest of the class, was really good. On the last test, I got a 95%, but I was still extremely proud of myself for getting the 86%. Well when my teacher saw, he immediately looked pissed. He asked me if I studied, and when I said that I had, he said, "well it doesn't seem like it."I asked him why and he said that he expected more out of me on this test. He was being completely serious too, i could see the frustration on his face. I realize that I've done better on previous tests but not all units are the same, and I just so happened to understand the previous section more. The rest of the class got between a D-C-, and he was very happy with them. Can someone please explain to me why he did this and how I can fix it? Oh by the way, another one of my classmates got a 99% on the last test and got a 81% on this test and he congratulated them because this was "harder material".