This paper examines the role of personality factors in academic achievement, specifically achievement in mathematics, using self-concept as a major aspect of personality. A sample of 21 high school students with advanced placement in mathematics were given Cattell's Sixteen Personality Factor Questionnaire (16 PF). A significantly high factor rating appeared on Factor E for the total group. Factor E (high end) is described as dominant, self-assured, assertive, independent, and bold. When the sample was separated by sex, additional factors began to emerge. Factor A (warm, outgoing) showed higher than average in the 13 boys while Factor O (anxious) emanated as higher than average in the 8 girls. Implications for teachers relative to students' personalities are discussed.