To elaborate: Black students in Texas outperform black students in Wisconsin, hispanic students in Texas outperform hispanic students in Wisconsin, and white students in Texas outperform white students in Wisconsin.
Overall test scores are higher in Wisconsin only because white students in both states are the highest scoring group, and Wisconsin schools have a higher proportion of white students than Texas schools.
To the extend that any of this can be copied, it would probably be better for Wisconsin to improve the test scores of its ethnic groups to Texan levels, rather than for Texas to emulate Wisconsin's lilly-whiteness.
Overall test scores are higher in Wisconsin only because white students in both states are the highest scoring group, and Wisconsin schools have a higher proportion of white students than Texas schools.
To the extend that any of this can be copied, it would probably be better for Wisconsin to improve the test scores of its ethnic groups to Texan levels, rather than for Texas to emulate Wisconsin's lilly-whiteness.