School marks in English, History, Mathematics and Science were obtained for five hundred and eighty-two grade ten students. Personality was measured by the thirteen non-intellectual factors of Cattell's High School Personality Questionnaire. It was shown that Factors C, G, F, Q2 and Q3 were significant discriminators between the students who did well in all four subjects ad those who did poorly in them all. In addition, Factors A, E, H and I were found to be significant discriminators between students who performed better in the sciences than in the humanities.