1. People in the Greek system would save all homework sets and exams in a "library" for future members taking a given course. While professors do change (and a single professor will try to mix up problems) with enough time you eventually have an inventory of all the possible problems, to either copy outright or study.
2. Eventually a similar thing moved online, both with "black market" hired help, then the likes of Chegg Inc.
3. All the students in a course join a WhatsApp or Discord group and text each other the answers. (HN had a good blog about this from a data science professor, but I can't find it now. College cheating has been mentioned many times on HN).
1. People in the Greek system would save all homework sets and exams in a "library" for future members taking a given course. While professors do change (and a single professor will try to mix up problems) with enough time you eventually have an inventory of all the possible problems, to either copy outright or study.
2. Eventually a similar thing moved online, both with "black market" hired help, then the likes of Chegg Inc.
3. All the students in a course join a WhatsApp or Discord group and text each other the answers. (HN had a good blog about this from a data science professor, but I can't find it now. College cheating has been mentioned many times on HN).