In this study, the differences in social self-efficacy and prosocial behaviour between students of high and youth schools were investigated. The random sample consisted of 394 students. Participants comprised 213 male and 181 female students; 198 of them were high school students, and 196 of them were youth school students. A Social Self-efficacy Scale (SSES) and a Revised Prosocial Tendencies Measure (PTM-R) were used. The findings indicated that students' social self-efficacy and prosocial behaviour scores were higher in high schools than in youth schools. The social self-efficacy of girls was found to be significantly higher than those of boys, however girls and boys did not differ significantly in overall scores of prosocial behaviour.