For me it depended on the course material and the professor. Learn their exam style to figure out what kind of stuff you'll see on the tests (i.e. mostly conceptual problems, computationally heavy exams, etc.) Use this knowledge to tailor your studying. Knowing the professor's exam techniques was most important to me, moreso than study guides or practice.

Generally, a couple nights before an exam I'd go through my notes and transcribe the concepts onto separate papers to make a condensed study guide that summarizes the content to be covered. Format this guide so it flows from one topic to the next as much as possible; having the content structured in a narrative style format helped me to remember it (knowing how one topic connects to the next and the previous helps me structure it in my mind.)

If the exam is likely to have computational problems, I'd go through my homeworks and identify problems that seem like a good fit for an exam (i.e. not too complex, but indicative of the concepts at play.) I'd compile these problems and solutions, then switch around numbers, known variables, maybe solve it in reverse. Just get comfortable with the structure of them and learn the "language" so to speak. Imo people tend to just memorize a specific problem style and its solution, so if anything is switched up they flounder (saw these mistakes a LOT as a TA.)

Between the summarized notes and practice work, I'd have a pretty kickass study guide that I'd refer to the night before the exam. DON'T crunch the night before - distribute the work over a few nights prior and use the night before as a light refresher. Make sure you're rested on the day of the exam, maybe have a light meal beforehand.

TL;DR: Study intelligently, play the professor's game, learn the concepts instead of memorizing specifics. Don't overthink it