Under the Every Student Succeeds Act (ESSA) of 2015, at least 95 percent of eligible students are required to take state-chosen standardized tests. The Federal Government does not exempt charter school students from taking standardized tests. 

All public schools (charter, magnet, and traditional) can have federal funding withheld by the U.S. Department of Education if at least 95 percent of their student population is not tested.

More information about ESSA can be found at: https://www.ed.gov/essa