Using a 17-year longitudinal design, this study examined the role of personal and family factors assessed early in life, and also academic and social experiences assessed in the first year of college, in predicting college completion. We followed a sample of 444 French-speaking Canadian children from middle to upper socioeconomic backgrounds (66% boys and 34% girls; 6 years old at study onset). We assessed social behaviors (i.e., aggressive-disruptive, anxiety-withdrawal, and prosocial behaviors), mothers' child-rearing practices (i.e., discipline and pleasure), and family resources (i.e., family structure, mothers' education, and mothers' age at the birth of the first child) at kindergarten; academic records in elementary and high school; and academic and social integration in college (i.e., adjustment to academic requirements, academic success, participation in social activities, and attachment to the institution). College completion at age 23 years was obtained from national official records. Using logistic regression analysis, we found that previous social behaviors, academic records, and family experiences had greater impact on college completion than did the quality of students' academic and social integration in college. We propose some avenues to better understand how precollege factors can improve a child's academic trajectory, college aspirations, and chances of success.