Keeping It In Perspective

Okay. After submitting what seems like millions of cover letters, resumes, and applications, I finally have an interview with the federal government! (which I don’t even remember applying to) It all works for me though. I’m really hoping that this works out for me.
I have testing on the same day as my interview which makes me a little nervous. If I have to answer essay questions, I’ll be all right because it was my major in college, but if I have to answer math questions, I’ll probably be lost.
I’m going to try and brush up on some general math concepts until my interview, but is there really anything else that I should be doing until my interview? Should I call the office and ask them what kind of testing there will be and what it will consist of? I don’t want to mess up this interview.