I think most IQ tests are pretty useless really, especially when you discover the incongruencies between them. I went through a phase of being obsessed with taking all the online ones, and the ones in a Hans Eysenck book of IQ tests, as well as the MENSA test. I was also tested at 9. At 9, I was in the 140s, according to MENSA, 155, according to the Eysenck book, between 140 and 180, and the online tests went as low as 125 and as high as 160. Needless to say, I generally avoid them like a plague now, unless I stumble across one that looks particularly different or interesting... also, I think you can learn to cheat on IQ tests...the more you do, the more familiar you become with the style of question and how to solve it.
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I am diagnosed as a human being.