Aptitude tests should predict student success at the university level. This study examined the predictive validity
of the General Aptitude Test (GAT) in Saudi Arabia. Data for 27420 students enrolled at Prince Sattam bin
Abdulaziz University were analyzed. Of these students, 17565 were male students, and 9855 were female
students. Multiple regression, logistic regression, and correlation analyses were conducted. The results show that
the best predictor of student success at the university was the combination of high school GPA (HSGPA) and the
National Achievement Test (NAT), as measured by cumulative GPA or by new students’ GPA. However, the
GAT was the best predictor of graduation as a criterion of success. Conclusions and recommendations for future
studies are provided.