This database reports each state's performance in the National Assessment of Educational Progress (NAEP) in mathematics, reading, writing, and science for grades 4 and 8.  Assessment results are reported on an irregular basis but are available generally every two years.  

The NAEP is the largest nationally representative and continuing assessment of what America's students know and can do in various subject areas. Assessments are conducted periodically in mathematics, reading, science, writing, the arts, civics, economics, geography, U.S. history and beginning in 2014, in Technology and Engineering Literacy (TEL). NAEP assessments are administered uniformally across the nation, and NAEP results serve as a common metric for all states and selected urban districts.