Test results (1968-1977) on the English and mathematics achievement subtests of the Washington Precollege Test (WPC), administered annually to the vast majority of college bound students in the state of Washington, were examined for evidence of test score decline. The following information from 300,000 students was analyzed by both sex and total group for each year of the ten-year period: the nine WPC English and mathematics subtests; high school grades, and high school credits earned. Early trends (1968-1972) paralleled national declines, since scores decreased on all but two of the mathematics subtests. Between 1973 and 1977, only the vocabulary and English usage subtests continued to decline, at an annual rate of two to three percent of a standard deviation. The applied mathematics subtest showed an increase, while the other English and mathematics subtests remained constant. Females scored higher than males on the English subtests, while males scored higher than females on the mathematics, spatial ability, and mechanical reasoning areas. Grades continually increased over the ten year period, as did the amount of credits taken. Largest increases were in the elective and miscellaneous courses; traditional academic areas showed slight increases. Overall grade point average was between a C plus and B in 1968, and over a B in 1977. (CP)