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The aim of this research is to investigate whether adolescents' academic self-efficacy beliefs, peer pressure, and trait anxiety predict their agressiveness or not. For this aim ,the data was collected from 231 adolescents who were students in different high schools in Turkey. In this research, the data was collected with The Scale of Agressiveness, Academic Self-efficacy Scale, The Scale of Peer Pressure and Trait Anxiety Inventory. To analyse the data, correlation coefficient and stepwise multiple regression analysis were used. According to the findings, while the most important predictors of the male adolescents'aggresiveness were peer presure and academic self-efficacy belief, the most important predictors of the female adolescents'aggresiveness were academic self-efficacy belief, trait anxiety and peer presure.