At Revelle College, UCSD, there was a requirement for a non-contiguous minor. Some of those people foolishly signed up for senior sequence biology classes. You could tell who they were when the prof posted the exam stats. The seniors had test scores ranging from 88 to 97...and the non-contiguous minors clustered from 63 to 66 (all 5 of them). I hung around with 3 other people on a regular basis in those classes. One of my group of 4 people always had the top score on any given exam in those classes. The points spread rarely exceeded 2 within the group. Even as a full classroom, the mean and standard deviation showed an exceptionally competitive group.