Data source

Kids Count Data Center - fourth, eighth grade reading, math, writing
National level resources - Click on the relevant "Test Scores" Indicator.
State level resources - Click on the relevant "Test Scores" Indicator.
National Center for Education Statistics - NAEP assessments reading, mathematics, science, writing
National level resources - Select the relevant category in "subject". Select relevant grade in "grade." Subsequently, follow instructions for each tab.
State level resources - Click on relevant state.