I did a pretty good review of the normal A/C systems before I went to class.The things like ele, hdy, fuel, air cond.Anything to give me a leg up time wise.This gave me more time in school for the things that were new to me.I ended drinking a little more beer than some of my classmates as I was not under pressure to study and read from sun up to midnite .It was my first glass, I came off the 727 and was 48 at the time.