They'll be testing your logic and flow of thought, not your knowledge of specific theories etc.If you've got common sense, can structure things and approach problems logically, and if you can do basic mental arithmetic OK, you'll be fine. They won't (for sure) be asking you to calculate standard deviations or that kind of stuff.Admittedly physicists/mathematicians are at an advantage because they tend to have more structured thinking than those who study 'fluffy' subjects, but on the other hand they usually lack the assertiveness and social skills.Just remember - use common sense.