Higher education administrators are seeking to identify additional effective student pre-college predictors of university academic success to utilize in an increasingly competitive admission environment. A study of more than 3,000 first-year students assessed a traditional pre-college predictor, the ACT, along with a new potential pre-college predictor, locus of control, to determine their effectiveness in predicting first-year student academic achievement as measured by end-of-first-year cumulative GPA. The results of the study indicated that first-year students who entered university with lower scores on the locus of control scale (internals) obtained significantly higher GPAs than those who scored higher (externals) on this same scale. Pre-college ACT scores also served as an effective predictor of student academic success as demonstrated by significantly higher cumulative GPAs at the end of the first year. In addition, this study found that first-year students retained to their sophomore year demonstrated a statistically higher GPA than those who were not retained. (Contains 1 table.)