According to the NH Dept. of Education: "Along with Virginia, Vermont and Department of Defense students, New Hampshire grade 4 students, on average, continue to have the highest performance compared to grade 4 students in all other states and jurisdictions throughout the nation on the NAEP Science assessment. For grade 8, New Hampshire students shared the top spot with Utah, Vermont and Department of Defense students....The achievement of New Hampshire students with a disability was also commendable. For grade 4, New Hampshire students with a disability shared the highest proficiency achievement with Massachusetts, Kentucky and Department of Defense students while grade 8 New Hampshire students with a disability had higher achievement than all participating states throughout the nation."
"NAEP, also known as The Nation's Report Card, is the only nationally representative and continuing assessment of what America's students know and can do in various subject areas. Since 1969, assessments have been conducted periodically in reading, mathematics, science, writing, U.S. history, civics, geography, and the arts. "