The purpose of this study was to examine the effectiveness of the Turkish version of the First Step to Success (TFSS) early intervention program on problem behaviors, social skills, and academic competence of at-risk students for antisocial behaviors in Turkey. Participants consisted of a total number of 102 students (53 students in experimental and 49 students in control group) and experimental group students' teachers and mothers. Experimental group students were subjected to implementation of TFSS while control group students were not. Results revealed significant differences between the scores of two groups on problem behaviors and social skills. Moreover, significant decreases in experimental group students' problem behavior scores and significant increases in their social skills and academic competence scores were observed. High levels of satisfaction were reported by experimental group students' teachers and mothers. Results are being discussed.