Hey man, I just got through taking my NFPT test. Yes the manuals didn't cover ALL the stuff the test covers but if you have your basics down and somewhat of an understanding of what takes places when you exercise then I believe you will do great. JP gave me a great site to get all your Articulations down before I took the test:
ExRx Articulations
Its a great site and gives you a greater understanding of movement than the manual gives you. Just study your ass off bro and I am sure will do just fine. Good Luck!