How I studied for finals my first semester: Played Mass Effect 1, completing every sidequest. Then half of Mass Effect 2.
How I studied for finals my second semester: Played Tales of Symphonia with every sidequest and played Virtue's Last Reward (Shoutout to Alex).
I haven't decided what I'll do this semester yet. Obviously I'll play Kirby, but other than that, I'm not sure. I'll probably finish off Tales of Xillia, Macross 30, Resonance of Fate, and Castlevania: Symphony of the Night. Then I'll learn Metroid Prime 2 100%. That should be enough to keep me occupied.