In this study, firstly, it is inquired whether disciplinary punishment, antisocial behaviors and alcohol and cigarette use mediate the relationship between school dropout and impulsivity. Secondly, it is examined whether the teacher support moderates between antisocial behaviors on school dropout risk. Participants were 478 students attending the public high schools in Ankara in 2009-2010. The results show that family and friend support reduce school dropout risk, but impulsivity increases it. Besides, disciplinary punishment, use, and antisocial behaviors mediate the relationship between impulsivity and school dropout risk. Teacher support moderates the relationship between antisocial behaviors and school dropout risk. The sex and achievement level of the students did not significantly predict school dropout risk.