<p>Many fraternities and sororities have test banks. </p>
<p>If the professor won’t change exams at all, then they’re inviting use (and abuse) of such a system. If profs don’t like it, they can make essay tests.</p>
<p>Other than that…how is a test bank different than any other sort of practice problems? The only advantage they give is that you have a better idea of how the information and questions will be asked by that specific professor. </p>
<p>In my experience though, test files are helpful, but they certainly don’t make up for not knowing and understanding the subject. And test files gradually lose relevance over the years as professors and concepts change, so they’re only as good as how often they are updated and cleaned up.</p>