[jawn]

How does moving educational goal posts based on race raise the level of education in the US?

Furthermore, the educational system you describe already occurs throughout many parts of the US. Test prep and the private sector is not an answer to a societal/cultural problem.

[yummyfajitas]

The point being made is that the US averages are being dragged down by a couple of underperforming minority groups.

If other countries do not have those groups, they can outperform the US even if their education systems are equivalent.