Oh, young one's so much to learn:
Inevitably in any college class there are one or two people who NEED these kind of credits to graduate, so they work extra-hard.
Case-in-point: First semester of freshman year I take geology to fulfill a science requirement. It's a big lecture class and wouldn't you know it there is a delicious looking super-senior who needs the credits or else she wont graduate that semester. SO what do I do? Of course, I start talking to her at 9:40 in the morning. She became my morning delight, which earned me the nickname Paulie Nooners, a name which I am still fond of. The point here is, if you bone the hot older graduating woman, she'll help you study and do better in a class like astronomy or astrology or whatever. Trust me, this plan never fails and also you get to have everyone on your dorm floor hear you banging a 22 yr old.
I pulled the same thing in 2 of my other crappy core courses and it's gotten me very far. 3.81 GPA