Having taken that test before, I would definitely get a study guide and work your way through it. Some of the questions get kind of esoteric and very specific, so even if your a Linux master, this is a thing where you should be studying for the test, rather then real life.

I’ve heard some reports that printing outer walls first has a positive effect on overhangs. I have it on in my slicer and it doesn’t seem to negatively effect anything.