Texas’ new education commissioner Michael Williams is considering a new system for rating school success that would take into account how well districts are closing the achievement gap that exists among poor and minority students, the Huffington Post reports. According to the Associated Press, schools and districts are currently rated and ranked based almost exclusively on student performance [1] on state-mandated standardized tests. The Houston Chronicle reports the formula for the new rankings, which were mandated by the Legislature in 2009 to accompany the new State of Texas Assessments of Academic Readiness, will also incorporate test scores, student gains and a post-high school readiness measure [2], though Williams says he wants the achievement gap measure to weigh more heavily than the other three indicators…