I think many of you are a little off with the scoring mechanism. The score range is 300-1000, right?
CISCO has verified that the absolute minimum score anyone can get is 300. This means that you can get EVERY question wrong and still receive a score of 300. In other words, you get 300 points just by clicking the mouse.
The passing score is 849. On paper, 849/1000 generally equates to a rough 85%. This is not the case however. A truer score would be more like:
549 out of 700 (849-300 and 1000-300). Doing the math this equates to a 78% score. This means that 39 correct out of 50 questions correct equates to a 78%.
CISCO, like Microsoft and Novell, use a weighted exam. Some questions are more valuable, points wise, than others.
If you are scoring a consistant 85% or better on simulations, and have a good 30-40 hours of study time in, take the exam.
Then again, schedule the exam first, then start studying. You can always contact VUE or Prometric and reschedule within 48 hours should you feel that you are not ready.
Good Luck.
-Frog