We've gone the route of trying to get really high IQ teachers/gifted coordinators with the thought in mind, like Grinity mentions, that they'll be better able to distinguish the difference btwn truly gifted kids and high achievers and levels of giftedness. We opted to keep dd10 is a specific school last year despite the fact that she'd get more in some areas in another school b/c the first school had a highly intelligent GT teacher where the other one had a GT coordinator who struck me as of no more than average intelligence at best.
We've also done private testing rather than trying to game the CogAT which isn't the type of test that dd tends to ace although I totally understand that isn't a possibility due to cost for everyone. Right now it wouldn't be for us due to a lot of other big expenses that have come up, but we were fortunate to have been able to do so when we did.
