Confident and scared. Anyone else?

in Network+
I have been studying for the net+ for the past few weeks, and since I also work with networks in my day job, I'm very confident about the material and think I'll pass without a problem.
However, when I take all these practice exams I find around on the web, I fail some of them, which has me worried. It seems that some of the questions on these practice exams are so extremely detailed, that there's NO WAY you can learn every number of every technology out there. So I'm also a little scared. I'm at the point that I think I should just forget about the exams, and keep studying.
Can anyone out there offer some advice about practice exams?
However, when I take all these practice exams I find around on the web, I fail some of them, which has me worried. It seems that some of the questions on these practice exams are so extremely detailed, that there's NO WAY you can learn every number of every technology out there. So I'm also a little scared. I'm at the point that I think I should just forget about the exams, and keep studying.
Can anyone out there offer some advice about practice exams?
Comments
Instead of concentrating on practice tests, I would suggest grabbing study guides from several sources. These will give you a quick overview and refresh for the details of the exam. I say several sources because the same info from different sources usually sticks in your head better.
http://www.cramsession.com/certifications/exams/network.asp?exam_id=126
http://www.mcmcse.com/comptia/network/networkplus.shtml
http://studynotes.net/indnet.htm
http://www.proprofs.com/mwiki/index.php?title=Comptia_Network%2B_Study_Guide
and of course, the technotes on this site.
The Fiber Optic Association www.thefoa.org
Home Acoustics Alliance® http://www.homeacoustics.net/
Imaging Science Foundation http://www.imagingscience.com/