The only IQ tests that are really accurate are the ones made for young children. Experience "raises" your IQ scores since it teaches you how to figure out questions. The more of that type of question that you run into the more easily you can come up with an answer. Coming to a test clean from much experience as a young child may do is a better indicator of inherent IQ.
It's actually a better tool in diagnosing learning disabilities and mental retardation than anything. I personally have never had the patience to answer finish any of those. Took one test back in elementary school but my mom never told me my score. Not sure why - maybe I flunked it.

She always says I'm quite intelligent so what can I say.
As long as I know where my weaknesses lie then I don't think it's a big deal.
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"Always learn the rules so that you can break them properly." Dalai Lama
My Karma just ran over your Dogma.