Investment Banking Intern

Filled out an aplication at my universities career resource center. I was sent an email and scheduled an interview through my schools website. On the day of the interview I was so nervous I didn't get any sleep. I was interviewed by two guys. A few personality questions were asked then I was asked to walk them through a DCF valuation. I knew how to do this, but I was so nervious and tired I forgot. There was also a math question that I had to do in my head and a brain teaser.