Group all of you NEC questions into one run through that way you don't have to keep going back to your code book and waste time getting in out and putting it away.
Don't let yourself get worked up over one problem, remember there are 80 so if there are a few you are clueless about its not the end of the world, everyone else in the room is feeling the same way about some of their problems.
Don't fall into the trap of 'I know I have an example of that somewhere in my 10+ reference materials" and spend a lot of time searching, save the searching till the last bit once you have answered all of the questions you know how to do.
Bring a cart/suitcase for your materials if you have more than a book or two, I was very surprised by how far of a walk it was to the testing room and my arms were tired from carrying 25lbs of books thrown into a box.
Finally relax, don't let all of the people after the test talking about how they aced it and it was so easy get to you, I'm convinced 98% of them are full of crap. If you studied hard then you should be fine.
Best of luck to all TAKING it, hope this helps a little.
