[dannyb]

In the US, there is a lot of emphasis placed on "closing achievement gaps"

It's easier to slow the smart kids down than make the slow/non-responsive kids perform better.

I don't think there is an active conspiracy or anything, just neglect. In the state of NJ, the only categories on standardized tests given to all K-12 students are Advanced Proficient, Proficient, and Partially Proficient. Advanced Proficient is really what you would just call normal. There is no recognition for high performers. Schools spend almost all of their time on getting kids above the Proficient mark because this is ultimately how funding will be allocated. Also, if you have too many kids below Proficient, the state can take over administration of your district.