Second-round interview for an ER Shop. I need help!

So I have a second round interview with an ER shop in NYC this Friday. I'll admit I'm not the best interviewer, but I really need this summer internship. I was wondering if there were any monkeys on this board who could offer a chimp like me some advice? I just want to know where to read up on some "technicals" (besides on WSO) and what I can do to better prepare myself. I'm a sophomore in college right now, and I don't know much about finance. I'm planning to play the "I'm eager to learn and make your life easier this summer" angle.

If anyone can help me it would be greatly appreciated.