Previous research has established that a relationship exists between the personality trait of conscientiousness and academic achievement. The current study extends prior research by using a path analysis model to explore various proximal traits that may mediate this relationship in a sample of two hundred and twenty three undergraduate university students. Consistent with previous research, a strong positive relationship was found between conscientiousness and academic performance as measured by final grades. Of greater importance, two factors were found to mediate this relationship: Academic Self-Efficacy and Test Anxiety. The current study illustrates the complex nature of the relation between personality traits and academic achievement and indicates that personality likely has a distal effect on academic performance through more proximal characteristics.