Answer:
The correct answer is: It reduces effortful control and lowers academic achievement.
Step-by-step explanation:
Research shows that when students exhibit extremely high levels of self-esteem, certain counterproductive behaviors may arise. For instance, and an over-confident student may not prepare enough when presenting certain tests because he/she feels that he/she doesn't need to study to pass exams because they perceive themselves as being naturally competent.
An over-confident student may be less disciplined and less conscientious with their studies out of lack of self-regulation or effortful control, which in turn can cause the academic performance to worsen.
So in conclusion, Academic and social competence are aided by realistic self-perception. And the effect of unrealistically high self-esteem have on effortful control and academic achievement is that unrealistically high self-esteem reduces effortful control and lowers academic achievement.