| I think they'll mainly ask you behavioral questions, since they don't expect you to know too much about the technicalities. However, you should have a good picture of how the economy as a whole, as well as the financial market are doing, and be able to tell them your opinion regarding some of the current events. Pay more attention to news that involve JPMorgan, and learn about what you'll do as an intern if you get it (they may ask you the question: what do you know about our work?). Also know the CEO's name, what the bank is doing to cope with the sub prime mortgage crisis, etc.
Just relax. The more research you do before hand, the more relaxed you will be. They sure won't hire people who appear shaky and nervous. | 
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