This is an exerpt from one of my posts to a similar question. I hope it helps;
"You interviewer may want to assess your level of understanding regarding the futures markets.I would ask you to explain the relationship between spot and front futures markets. How program trades are executed. Whether you are familiar with basket execution methods, and arbitrage methods. Do you know how to execute orders manually if you have to. Do you have knowledge of any of the many automated execution systems. What type of risk management protocols are you familiar with. How do you currently size bets. How do you factor in the overseas markets, bonds, oil, gold, etc into your decision. What is track record to date? Are you familiar with any programming languages. Do you know how to organize a basic spreadsheet. These are a few of the basic questions you may be asked.
Steve