Sybex practice tests as a gauge

in SSCP
I'm in the final stages of reviewing for my exam and am wondering how everyone feels about the Sybex exams. I am currently using the online test engine and based on the results I have been able to narrow down my weak areas, or so I think. I'm curious how well these practices exams actually gauge ones readiness. I realize there may be better ones out there but this is currently what I have to work with. With the clock ticking down to go time I just want to make sure I'm not wasting my time.
Comments
'My dear you are ugly, but tomorrow I shall be sober and you will still be ugly' Winston Churchil
CryptoQue Do you use the Practice Test Book? How many Questions they have? Thanks!
Thank you! If I am reading the guide and using the questions of it. Leave me alone, that you refer to those questions and answers. I think buying the practice book, I'll be well prepared.
I have only done 3 domains so far. I plan to kick in gear next week
Since you must have done the exam by now, how well you can answer your own original question (Sybex practice tests as a gauge)? I am also going through the Sybex practice exams and achieving in the 80% range. It will be much appreciated if you can give your opinion.
Thanks.