Oh sorry I interpreted it as a hypothetical or something :)

My interpretation of the way US lecturers work is that they may reuse entire exams. Especially as a lot just get exams from book publishers.

In NZ (at Canterbury at least) all exams are archived and available in the libraries, and most also as PDFs. All of them. Shelf after shelf stretching back decades. At least back when I was there - maybe it’s different now? Publishers selling exam material as part of their text books seems to be moderately recent