What is expected of me as an intern?

Hi all,
Just about a month ago I have registed to this site. I am going to start an internship at a boutique m&a advisory firm. Its a local firm and part of oaklins. I have about 1 month to start and really wonder what I am going to do, Analyst who interviewed me said that interns mostly do research and work in excel. I have been using excel for about 3 months now but I have mostly used pivot tables not functions. What advice would you give on spending this 1 month period to ace my internship. Thanks