Group differences among ethnic and racial groups on a series of educational measures and outcomes are examined. African-American and Hispanic students perform substantially lower than white and Asian students on the SAT I. These substantial differences also exist on a variety of other admissions tests used for undergraduate, graduate, and professional programs. Similar differences are found on national testing programs such as NAEP and NELS, as well as on a variety of performance assessments. These results are consistent with differences in high school grades, the rigor and intensity of high school curriculum, college performance, and graduation among these groups. Differences in socioeconomic status (e.g., parental education and family income) are examined across these measures within and across ethnic and racial groups, and account for a large portion of the group differences found across these educational measures and outcomes. The report provides a comparison of group differences across a variety of measures and discusses the impact of social stratification and academic preparation on these differences. An appendix contains additional tables and figures.