Chintito question 4 on fuel pressure. The correct answer is "A" - to prevent vapour lock. What they are getting at I believe is the need for LP and HP fuel pumps. Between the tanks and the engine the fuel lines often pass through unpressurised parts of the aircraft so to prevent vapour lock LP pumps are fitted at the tank. The pump cavitation answer is more to do with hydraulics I believe. Please feel free if I am wrong (I dont have my notes infront of me).
I got 79% in Feb systems - hope you all get the passes you are after.