My college Chemistry teacher last semester. So I took regular Chem in highschool and I had a really good teacher to the point where I nearly remembered everything I learned. So I sat through this chem class the whole year and I knew everything my teacher was talking about because of my good memory. However, I probably got the worst teacher in the world. This guy was super anti-cheating that he would go to great lengths to make his tests super difficult/different to be sure that no one will cheat. Every test we had all had 3 versions composed of entirely different questions and then put on extreme difficulty. Often times I found questions on the test that he never covered in his lecture whatsoever. On top of the ridiculous tests he also gave homework which took hours for such a simple concept and also had no teaching benefit. Sometimes even the TA's couldn't do the problems. And I remember there was one question we had about drawing a graph and when we asked for help the TA told us just to copy the graph from the lecture notes directly, no one had taught us how to do it. I ended up with a B in his class, idk how. But he made this general chemistry course much more difficult than needed.