I'm preparing to write the Security+ exam on Friday... I've studied a couple of books specifically on the subject (one of them was Sybex). I am also practicing with Transcenders, and although I am passing each practice test, the margin by which I am passing is a little concerning. I noticed that the passing cut-off is MUCH

higher than with A+, Network+, and
i-Net+. What is the actual passing mark, and how well should I be doing on Transcenders before attempting this exam?
Any insight would be greatly appreciated.