Had a complaint from a student about my last exam. Basically that their performance was poor yet they have been doing so well up to this point so my exam must be bad. I will admit my exam questions are hard. I tell the students that a hard exam is really in their best interest. If they are a good student then they will do well and be differentiated from the poorer students. If they have been doing poorly a hard exam is the only way they can pull their grade up. If the exam were easy everyone will do well and they would remain at the bottom. The students never understand this.