There is clear evidence that the average grades earned in high school have been going up for some period of time. This study examines the question of whether students of varying backgrounds have experienced similar increases in grade point average (GPA) over a 25-plus-year period. Changes in SAT verbal and mathematical scores for the same gender and racial/ethnic groups are also examined. Trends in the grading practices of major subjects in the high school curriculum are presented, as are changes in the GPA and test scores for students clustered by the type of community in which their school is located and whether it is public or nonpublic. Three appendices are included: (1) Mean GPA by Year, Gender, Ethnicity, and Parental Education, 1976-2002; (2) Mean SAT-V and SAT-M by Year, Gender, Ethnicity, and Parental Education, 1976-2002; and (3) Ethnicity, Gender, and Parental Education.