I don't understand where this concept of "knowing what's going to come up in the exam" has come from. No one knows what's on the exam, the first person (other than the writers of the exam) to see the paper is you, the students, so how can anyone else tell you what's going to come up? And besides, realistically who would risk their job to tell someone they don't even know what's going to come up on the paper?! Its absurd!