I took about 28 practice tests over a three month period before the real thing. One of the reasons I took so many practice tests was to ensure that I felt completely prepared and did not bomb the real thing due to nerves.
Over that three month time period I worked through PowerScore's Logic Games Bible and their Logical Reasoning book. My scores went from the 161-164 range up to 170-174 range near the end. In the end I got a 168, which was basically my median/mean (the two were very close) from the last ten or so practice tests that I took. And yes, I am a geek for crunching those numbers. But the point is, while I did not do as well as my best practice tests, a large number of practice tests did predict my actual score.
One other thing, the night before the real test my neighbors had a wild party and I was both unable to get to sleep when I wanted to (early) and unable to sleep through (they woke me up around 4AM). So I went to the test feeling very sleep-deprived. During the test I was sure that I bombed it, particularly the logical reasoning portion, which I barely finished in time. I think that having done so much practice was vey helpful to me in my sleep-deprived state. So I would recommend to others that they take as many practice tests as necessary to feel very, very confident going in, and so that they are not thrown off by something like a poor night's sleep the night before. Just my two cents.
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