Law Of Recurrence
When I was in my first year of law school in 2015, the library had two exam banks: one was physical copies of old exams you could borrow for in-library review, and the other was digital scans of old exams. My first-year contracts professor had never allowed any of his exams to be in the digital bank, but there were twenty years’ worth of physical copies.
During the finals period, my study group checked out the last ten years of exams and took them to a study room. We quickly noticed that the professor only had three exams, and he rotated them in a pattern. We still studied all the tests to be on the safe side, but also made an appointment to meet with the professor the next day during office hours.
Another student and I went to the meeting, asked questions about things we didn’t understand, and then I carefully brought up the rotating exams.
Me: “Professor, we noticed that your old exams from certain years are… very similar to exams from other years.”
The professor sat back in his chair and smiled broadly.
Professor: “That’s why I’ve never allowed my old tests to be put into the digital exam bank; I want people willing to make the extra effort to do well. Most people don’t even bother checking out the physical exams, and even those who do usually only check out the last year or two, so they don’t notice the repeats. If I were you, I would study the tests from three, six, and nine years ago VERY carefully.”
We did exactly that, and it was my highest exam grade that semester.
