In this study, the effects of preschool education on primary first graders' school preparedness is analysed in terms of gender, mother's and father's educational level. A total of 170 primary first graders attending primary schools with kindergartens comprise the sampling of this study. The data was collected through the Metropolitan Readiness Test and Family Survey. The data were analysed by using t-Test and two-way analysis of variance. The results revealed that preschool education and parents' educational level have a significant effect on children's level of school preparedness. However, gender did not create a significant difference in children's school preparedness.