I have been observing testing at my son's school for 6 years. I can tell you that the kids who care about the test do better on the test and those who think it's a waste of time, tend to blow it off and not do well. Many of the kids who blow it off are smarter than the kids who do well. The social circumstances are very important and I be very wary of trying to say anthing about actually ability based on standardized test scores.