I'm a 5th year PhD student who is teaching a large (80 student) section of a course, this is the 4th course I've taught. I've also taken plenty of exams as a student, and they are still fresh in mind.<p>I would want to know more information before I decided the students were cheating or not. The instructor refereed to an "exam room", and gave an hour range that the new exam could be taken. So the students are not all taking the exam at the same time, this makes it seem possible that the exam is online. If the exam is online, and the students can take it at home vs take it in a proctored room, that would change what would be cheating. If it were online at home (I don't think so from the video) then reviewing the test bank while taking the exam would be cheating. If not, then having seen a question before the exam may or may not be cheating, depending on HOW you saw the question.<p>If you did not acquire questions in an unethical way, then it's not cheating, it's just studying. As an instructor, I will sometimes put problems from the book onto my exam. If the students worked the problems before because they were studying hard, then good for them! I want my students to study, because it will help them learn. I also provide a sample exam with previous exam questions on it; I write most of my own questions and it's important for students to get used to my style. As a student, I had to take a written exam for my PhD. When I was studying for the exam I asked Professors for help, one of my Professors gave me some of his questions. I worked out every single question. He also submitted one of his existing questions to the exam and I recognized it when I was taking the exam. Cheating? No. I just got lucky (and worked my ass off).<p>If test questions are acquired by malicious means, or knowing that they are going to be on the exam, or are the test bank that is going to be used to make the exam. Then it is cheating. So if students knew that the questions came from a test bank, and downloaded the test bank (I'm sure it's on the web somewhere) to gain an advantage they cheated.<p>Finally, as an instructor. Writing a decent exam is surprisingly hard. My goal with an exam is two-fold, figure out how well the class as a whole is doing, and separate the students into their grade groups. The ideal exam has some problems that even the D students can answer (to separate them from the F's) and some problems (usually just 1 problem) that are a stretch for the A students. And a mix of medium problems for everyone. If you have too many easy problems, the grades will creep up and you won't separate students. If you have too many hard problems, the grades will creep down and you won't separate students. Writing an exam from scratch is very time consuming. I use my private test bank, and try to add 1 or 2 new questions to the bank when I'm writing each exam. I can understand (but don't agree with) an instructor pulling entirely from an existing bank to write an exam.