I have to agree that a child who is able to cooperate and perform in the testing setting will score higher than a child who is just as bright who for whatever reason just wasn't able to pull it off on testing day and those fluctuations will most likely settle as the child gets older, but since IQ tests for the very young do not test reading or counting, those early skills do not play a role at all from what I gather in my limited experience. My DD at 3.4 years was asked to arrange blocks or pictures and my child wasn't even asked to count to ten though she can skip count, count backwords, do simple math etc. They didn't ask her to read one thing though she can read quite complicated words so those skills didn't play into her scores at all. One part that I did think could be inflated or deflated due to exposure was the general knowledge section of the WPPSI. I just felt that the test for someone her age didn't even get at the things I see in her that show her gifts, though in their minds she scored quite high, I just sensed there was more to be shown...