In calculating these ratings, GreatSchools analyzed the 2010-2011 Texas Assessment of Knowledge and Skills (TAKS) reading, writing, English language arts, math, science and social studies results for the school and compared them to the TAKS results for all Texas schools with the same grade levels.
If there are no GreatSchools Ratings for a school, the school's test results were either not reported or incomplete. The different student groups are identified by the Texas Education Agency; if there are a small number of students in a particular group in a school, data is not reported for that group.
Keep in mind that when comparing schools using GreatSchools Ratings, it's important to factor in other information, including the quality of each school's teachers, the school culture, special programs, etc.
GreatSchools Ratings cannot be compared across states, because of differences in the states' standardized testing programs.
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