Go out and buy something for <$5 for your significant other. No seriously, do it right now. Then give it to him/her the next time you see 'em. Surprising them out of nowhere with something cute and thoughtful, or even something "boring" or "lame" like their favorite candy bar or a flower or a new guitar pick will make their day, especially if they were having a crappy day beforehand.

If you are getting a letter of recommendation for graduate school or something, tell them you need it a week or two before it's actually due. If a professor flakes out on you (something that can be all too common), you're not completely hosed because you provided yourself a safety net. You don't want the integrity and punctuality of your application hinging on the responsibility of someone else.

Another study tip: When you get back from class, spend a little time and type up all your handwritten notes. I find that stuff just sticks in my head when I do, with the added bonus of not having to decipher my handwriting when I do go back to check them. I also retype my notes again instead of studying.