National Center for Policy Analysis:

The Obama administration recently attempted a pre-emptive strike on Texas Governor Rick Perry by unleashing Education Secretary Arne Duncan to attack Texas’ record on education. Duncan’s arguments have generated a lot of useful discussion across the web, but Andrew Biggs, a resident scholar at the American Enterprise Institute, throws some rudimentary data analysis into the picture.
If you look at Texas’ simple average test scores in reading and math for fourth and eighth grade students, they’re about average. But Texas’ schools serve a population with several challenges, in particular many low-income and Spanish speaking children.