RateMyProfessors
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Grade Changer
Ratemyprofessor is a pretty useful website for professor reviews. It's really easy to use, and you can add professors to review if they're not there already. It's also pretty accurate for the most part. The only reason I rated 4 stars was because they took down a negative review I posted about a terrible professor. I'm not sure what the reasoning was, whether they didn't like what I said (although it was free of profanity and anything hateful) or if they made a mistake, but that definitely dropped their reviews one star.