Good advice there from Epi. I retook my NR just a few weeks ago because I work in a state that doesn't require it and let it lapse (don't do that.... :wacko

. You should prepare like any other test: get plenty of rest, avoid alcohol for a few days before, review if you like but don't "cram," get there in plenty of time before the exam starts, etc.
As far as the paramedic test specifically, read every question AND every answer before you make a choice. Try not to over-think questions. There are no trick questions! Some are worded poorly, IMHO, and some have two answers that will look right - remember you are looking for the "best" answer.
But like Epi said, relax! You really do either know it by now or you don't. If you've done your homework, so to speak, you have nothing to worry about.
Good luck, let us know if you have other questions, and let us know how you did!
NJM