I don't think lack of exposure to enriched curriculum would matter for the IQ test. For the achievement test, from our experience, my DS7 did not have much of enrichment except several weekend classes at the CTD from NW. He only had a couple of math classes and one science class. When he took the MAP test, he was in 99% in both reading and math. We didn't really teach him much outside of school. So he was pretty much on his own.