I failed a few of my NREMT psycho motors the first time, thankfully I could retest the same day, and passed.
Failed KEDs because I forgot to say I was going to transport.
Failed supine, because the patient was a child, which threw me off. Ended up running out of time. Lesson learned.
Failed medical in Circulation because I forgot to ask if there was any life threatening bleeding.
If you are taking the NREMT written, make sure to schedule an appointment after 10am, unless you are a morning person. Which I am not. NREMT is very very simple, in a sense. Read the question, and remember what you have learned.
-BSI/Scene safe
-ABC's.
National will throw you a bunch of cardio info, but the correct answer is check the airway etc.
They also like GCS questions, which I was horrible at, but found a site that helped me practice.
http://www.sporcle.com/games/txsling/glasgow_coma_scale_for_cases
Lastly, get a good nights sleep, which will be hard due to anxiety. The day of the test, don't bother looking at a text book. If you haven't learned it by then, you won't learn it in a few hours. Do something to relax you mind. Eat something before you go, and try to avoid excessive amounts of caffeine.
Good luck.