Even if the professor doesn’t provide them, you need to socialize around to find which frat or sorority has filing cabinets (or digital scans, I guess nowadays) of old exams. And if word gets around that you did well on tests, be prepared to be treated out and schmoozed by younger students to give them old exams and problem sets from your recently completed course. Unfortunately, studying for exams honestly (becoming educable in the subject by learning the principles) does not pay off unless the exam creator is creating problem sets from scratch. Perversely, with this degree-mill mentality of “learn the metric, not the material”, you should avoid new professors who are more likely to be creating their own teaching materials even though the whole point of academia is to create social connections with precious generations of researchers to push science and humanities forward.

Honestly, I wish there were less roundabout ways than exams to funnel those who are only interested in getting a certification from those genuinely interested in preserving and building our civilization’s knowledge.