NAEP long-term trend results indicate that the average reading and mathematics achievement of 9- and 13-year-olds improved between the early 1970s and 2012; however, only 13-year-olds made score gains from 2008 to 2012, and they did so in both subject areas. Average reading and mathematics achievement for 17-year olds did not change significantly between the early 1970s and 2012 or between 2008 and 2012.
Average reading and mathematics scale scores on the long-term trend National Assessment of Educational Progress (NAEP), by age: Selected years, 1971–2012
NOTE: Several administrative changes were initiated beginning with the 2004 assessment, including allowing accommodations for students with disabilities and for English language learners. To assess the impact of these revisions, two assessments were conducted in 2004, one based on the original assessment and one based on the revised assessment. In 2008 and 2012, only the revised assessment was used.
SOURCE: U.S. Department of Education, National Center for Education Statistics, National Assessment of Educational Progress (NAEP).