This study was undertaken to examine the relationship between "Personality fitness" and academic achievement. One hundred seventy-five subjects from three educational levels--university, vocational technical institute, and high school--were administered the Eysenck Personality Questionnaire, the Raven's Advanced Progressive Matrices and an Information Questionnaire. It was found that personality dimension of intraversion had the highest correlation with academic performance in the university sample, especially for the "hard sciences" students. Ravens intelligence score was the best predictor for the vocational technical institute sample. Personality dimensions of neuroticism and psychoticism, as well as average number of study hours added differently to the multiple regression equations for the various samples. (Author)