This report profiles the mathematics enrollment patterns of 692 junior and senior high school students in the Mesa Schools from fall 1980-81 through fall 1981-82. The motivating purpose of the study was to determine whether high-scoring Hispanic students avoid taking more advanced mathematics courses, but it included Black, Indian, Asian, and White students. The top three stanine scores of the California Achievement Test were used to define the total population of 4,401 White and 347 non-White students. All non-White students were included in the study, along with a modified random sample of White students. For all races, a reasonably high percentage of these students enrolled in college preparation mathematics throughout high school. In particular, 60% of the Hispanic students compared with 53% of the White students with high scores in grades 10-12 enrolled in college preparation mathematics courses. However, a downward trend was exhibited after grade 9 in the percentage of students enrolled in such courses. The Asian students surpassed other races in mathematics participation at every grade level. Females enrolled in as many or more mathematics courses as males within each race. The appendix includes tables giving the frequency distributions by race, stanine level, and type of course. (MNS)