I'll add a couple of other things:
Come with an open mind and willingness to learn. In each of the classes I've been to, there are always a couple of guys that are just too stubborn to learn. Like F2S said, if the instructor is teaching you a certain way to do things, do it his/her way. The last class I was in, a guy got pissed because all of the techniques (draw, presentation, stance, grip, etc.) were all geared to the isosceles stance and not the Weaver. It was like pulling teeth to get him to try isosceles. The guy paid a lot of money to the instructor for the opportunity to ignore what he was teaching.
Be helpful during setup/cleanup. My first priority is to make sure I'm ready to participate in the drill, but if my feces is cohesive (mags are loaded, I'm hydrated, etc.) I will try to help the instructors set up the range for the next set of exercises. I remember setting up some steel targets, and about half the class pitched in. The other half just stood there watching. The less time spent setting up the range, the more time for shooting.
Just a few I've observed.
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