What should I brush up on as a Summer Financial/Sales Analyst for a Video Game company?

Hey all,

I'll be working this summer full time as a finance intern for a video game company. The women I met with said that it would be a lot of sales analysis, some possible forecasting, and a heavy amount of excel data mining to find trends in their sales on different platforms. Anybody have any recommendations on specific topics to brush up on, places to practice financial modeling, or any other programs (outside of Excel) that I should be familiarizing myself with?

Thanks.