They test math skills, reading comprehension skills, critical thinking, spatial reasoning, psychological and emotional stability, things of that nature.
OK list of websites:
www.bernsteintestprep.com
www.state.nj.us/personnel (study guide and orientation guide for multiple choice exam)
www.publicsafetyrecruitment.com (it says in the study guide for additional exam orientation and prep materials)
And right in front of me from the dept of personnels website: "Applications must be postmakred on or before March 31, 2006." So not to sound like a jerk or burst your bubble but you can't test for another 2 years man. Oh well, look on the bright side, you have 2 years to study your ass off for this thing. I take the test next month, and I'm TOTALLY not ready, lol.