Honestly, IQ tests in our experience are a snapshot of one day. One of my kids is easy to figure out (at least for me
) and she tests very consistently as gifted. Every ability or achievement test she has taken since age 6 has put her at the 98th-99th+ percentile. My other daughter is very difficult to figure out and she has had wildly different results from day to day and year to year. I still can't tell you if she is gifted or what she needs academically although I am getting a better idea and I don't think that it is going to fall into a path that can easily be met by a ps system even if she isn't gifted.
We had her tested on the WISC-IV at 7.5 b/c we had an inexpensive opportunity to do so at a university. She came out in the low 140s for her IQ and 148 for her GAI (general ability index which is used in lieu of IQ when the processing speed or auditory memory indices significantly depress the total score). The GAI was in the 99.9th percentile. The following year at school (3rd grade) was a disaster for her with a teacher who thought that she wasn't that bright and that I just wanted her to be smart b/c her sister was. Her achievement scores sank like a rock and ended the year lower than they had been in 2nd grade. They gave her the CogAT (group ability test) in class along with the entire 3rd grade that year and she came out in the upper 80s percentile wise which we were told by the teacher "proved" that her IQ scores were wrong and due to "good guessing."
We had her retested at the end of that year to try & figure out what was going on. The same IQ test from a year earlier was 20 pts lower at that point -- 127, I believe (97th percentile), which is actually a huge drop. She was given another IQ test (RIAS) which was "uninterpretable" b/c the scores within subtests were wildly variable and could not be averaged. So, the psych also gave her the SB-5 (another IQ test) and the WIAT (an individual achievement test). Her WIAT scores were in the 98th & 99th percentile for everything which is much higher than would be expected if the second IQ results were accurate.
The SB was in the "bright, but not gifted" area -- around the same as the CogAT. I'm not too sure on those scores b/c the psych had never given that test before, dd was sick on the day she took it with a temperature, stuffy nose and woozy head, and her scores varied from the 16th percentile to the 98th within subtests. She totally bombed one portion where they were asking what was wrong with the picture and she was seeing things like dissimilar tree species that could not be grafted together rather than the obvious they wanted.
My point is, on one child, I have IQ scores that vary by around 30 points over the course of one year. In her instance, divergent thinking seems to come into play here b/c she doesn't tend to give the expected answer. Creative thinking is not always going to help you score well on an IQ test.
I'd go more with who you know your child to be and what you think he needs than what one test tells you.