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One of the most useful classes I've taken in college has been introductory psychology, the historical lessons aren't that interesting, but the fact that it got me thinking and talking about the patterns of one's own mind. Learning about how I learn helped massively in later classes.
For example, being in new environments when you're studying can help a lot with retention. As can associating facts with memories of some emotional charge (Play around and be happy while discussing a subject with a friend!). Spaced repetition can help offload the pain of cramming, too. The list goes on...