I wasn't trying to blame as much as point out that perhaps the immigrants may be overwhelming the system so that the school systems can't keep up on the standardized tests. But I don't know the statistics in Texas so I posed the question.
The decline in test scores has been going on for 30 years or more, across the board, in school systems rich and poor, urban and suburban, regardless of ethnic demographics. The schools have more money and more employees than ever, yet the failure persists because it is inherent in the system.