The problem with any of these tests is that over-competitive parents and schools simply start training their kids to pass these tests at an early age. You end

The problem with any of these tests is that over-competitive parents and schools simply start training their kids to pass these tests at an early age. You end up with kids who only are able to properly process a line-length test. Asking them perhaps to discern a series of squares of different sizes could potentially roadblock them. IMO, the bigger issue is that we expect all children to be at the same learning development stage at any given point in their life and to respond equally to a given teaching approach. So, all 5 year olds get lumped into a particular curriculum, and then as 6 year olds move as a group to the next stage. Actually, I think the schools don't REALLY expect that,they just don't care to figure out a better approach.