Everyone in my group had to draw something. (Gear, Electrical, fuel) Most everyone got the electrical system and know it in detail! What items are in which buss....ect. The only 121 questions were on the ATP test. I was asked questions about the current flying I am doing now. (CFI) Examples of my questions: aircraft systems, single engine ops, FOI, approach plates (Jepp), and enroute charts (Jepp). I have prev 135 experience but wasn't asked any question on it. The guy I had just asked question on what I was currently doing. Good Luck!