"The latest scores of NAEP, the closely watched national assessment taken by a sample of 4th- and 8th-graders in every state, showed that California largely followed the national pattern this year with little to no change in math but a significant decline in 8th-grade reading on a scale of 500 points."

"As with [California's] annual standardized assessment, the Smarter Balanced test, there remain huge disparities in performance on NAEP among racial and demographic groups and progress in closing the gaps has been mixed."

https://edsource.org/2019/reading-scores-drop-in-california-most-states-in-much-watched-national-test/619237