you misunderstood, my answer started with 'right', had second your notion by pointing out how very unawares of even more blatant facts these kids must be
I agree that the majority doesn't perform well, but I don't agree that, as things stand, one could expect them to perform better. Many that arrived in the US or Europe with may difficulties from countries with much less opportunities know that these don't come for granted and therefore will make better use of them. If the US kids were more aware of how unique their possibilities are one could expect them to do better, that's why I had agreed with your first statement