Standardized testing in US education spans two largely distinct domains. K-12 state assessments, mandated since No Child Left Behind (2001) and continued in modified form under ESSA (2015), measure schools and identify achievement gaps. College-entrance tests (SAT/ACT) have been used since the early 20th century for admissions selection.
The COVID-19 pandemic disrupted both. Most selective colleges adopted "test-optional" policies; several have since restored test requirements, citing evidence that scores predict college performance and that dropping them disadvantaged some applicants. Meanwhile, K-12 testing has faced criticism for narrowing curriculum, consuming instructional time, and reflecting socioeconomic gaps rather than school quality.
Research is contested: tests do predict some outcomes meaningfully, but they also correlate with family income, and the relative weight they should carry in high-stakes decisions remains disputed.