The purpose of this study was: (a) to investigate the effects of socioeconomic background, locus of control, intelligence, and self-esteem on academic achievement of Nigerian secondary school pupils; (6) and to examine the relationships of locus of control to socioeconomic background, intelligence, self-esteem, academic achievement and prediction of academic performance. Eighty secondary school boys completed the Socio-economic Background Questionnaire, the Raven's Standard Progressive Matrices, the Brookover Scale of Self-concept of Academic Ability, and provided estimates of prediction of their own academic performance. The analyses of data revealed that : (a) all the four independent variables (socioeconomic background, locus of control, intelligence, self-esteem) had significant positive effects on academic achievement; (b) internality significantly positively correlated with intelligence, selfesteem and academic achievement; (c) the internals were significantly more accurate predictors of their own academic performance than the externals.
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