Did it about a year ago. 50 question basic knowledge test. Questions were supposedly from the ATP written but they were basic knowledge for anyone who has ever flown a plane before. Then did interview part. Simple questions on IFR regs and some other basic knowledge things like what color are runway edge lights, what is hypoxia, etc. They give you a Jepp approach to brief and if you have never seen one before don't worry. They are pretty simple to work through and you can find some online to practice with. If you're ever confused 99% of the answers are on the chart itself and briefing points are mostly in bold. Then there was basic HR stuff like why do you want to be a pilot, etc. Overall really simple. Don't get worked up over it. Nothing a commercial pilot shouldn't know.