They test your communication skills and knowledge of spreadsheet software. They have you write a fake letter to a customer and then you have to construct a graph/table in a program similar to excel. I was then interviewed by the president and vice president of the company. When I was offered the job, they were unwilling to let me have more than one day to think the offer over/discuss it with my spouse. Speaking with other employees, I've learned this is a common tactic of theirs to generate an urgency to accept their offer.