Personally, I wouldn't recommend preparing at all.
Just be yourself.
I got an internship at Morgan Stanley one summer, and I messed up the technical questions hardcore. So I started to joke with the two hot girls interviewing me.... it was fun. We talked about clubs in Manhattan and the like. I left the room thinking "Well, there goes that job". I ended up beating out 25 other candidates...
You guys overthink things.
If you can't socialize/come up with answers on the spot, spend a little bit more of your day interacting with humans, and not with computers
On a side note, have you guys ever interviewed anyone? Well if you have, you'd know that the LAST thing you want to see is regurgitated answers... once you start hearing those, you're made up your mind within 5 seconds.