The aim of this article was to establish the relation between self-control and a group of variables: academic performance, grade and gender, in 87 students of transition, second and fourth grade. To measure self-control, it was selected an election task between a delayed reinforcer and an immediate reinforce. This task was presented in a group activity simulating real election events. The results indicate that the academic performance and grade variables were associated positively with self-control, indicating statistically significant differences. In addition it was observed that women tend to delay the reinforcement at higher rates than men do.