Maslow, ABC's.
"if I can only do one thing for this patient before I walk away what would that be."
Practice, practice, practice questions. The practice some more!
Look for the "odd man out" if you're stuck, also if 2 answers or more say the same thing in different ways they are likely to be the incorrect ones.
Use Kaplan once you're happy with your content knowledge. the live courses are great for honing those critical thinking skills.
Check out the N-CLEX threads but don't get scared - avoid ANY that talk about failing - it'll depress you!! Or scare you!! Or Both!!
Find a relaxation technique that works for you, you may want to use it in the exam to get you to re-focus & calm your nerves.
Good luck - you can do it!