Most NAEP data from 1990 to date are available online in the NAEP Data Explorer (NDE). This database allows researchers to familiarize themselves with NAEP and test their preliminary hypotheses before requesting a license for further exploration.
The NDE provides results from national (public and private school) and state (public school only) levels. NAEP assessments can be viewed by grade and subject assessed. You can customize the data displays according to your interests. Special versions of the NDE focus on the long-term trend assessment, the High School Transcript Study (HSTS) and the National Indian Education Study (NIES).
Other NAEP data tools are available that present different views of the data to guide your NAEP research, including the Questions Tools, Items Maps, State Profiles, and District Profiles.