Midterm is almost over

I'm so so glad that I am over with two classes' midterm tests. I did very well on one, and the other...I may get B. Well, but it's okay. At least I could answer many of the questions. I'll always remember to test students only the things I covered in the class, though. I don't understand teachers who would test students with things that were not covered in the class. But...what can I do about it? Nothing. If I don't like it, I guess I'll have to be the professor. I may.