While student populations are growing, the gatekeeping devices of teacher certification examinations prevent many who want and are trained to teach from entering the profession. If failing these exams predicted failure to teach well, blocking students who do not pass certification exams from entering the profession might be a well-reasoned policy. However, many studies indicate that there is little correlation between certification test scores and quality of teaching. The present study investigated the effectiveness of a program to improve the scores of Texas elementary preservice teachers on a required certification exam. The program consisted of one-on-one coaching of preservice teachers upon the completion of coursework and prior to their taking the state's certification exam. Subjects' scores on a representative form of the certification test were used as pre-treatment measures. The content of the treatment program was individualized for each subject and determined by the specific items missed by each subject on the representative form. The post-treatment measure was the subject's score on the certification exam. Scores on the representative form and on the certification examination were compared to determine if there were significant differences between scores of preservice teachers who had been coached and those who were not coached. Since subjects voluntarily enrolled in the treatment, initial differences between coached and uncoached groups were controlled through analysis of covariance and pairwise matching. Descriptive statistics, t-tests for dependent samples, repeated measures analysis of variance, and univariate analyses of variance and covariance all indicated that there were statistically significant differences between the scores on the certification test of coached and uncoached students. Coached students showed greater improvement in scores than uncoached, with Hispanic subjects showing greater improvement than Caucasian subjects. Analyses that examined the differences between the coached and uncoached subjects on the domain and competency scores that make up the raw scores failed to indicate the sources of the differences in raw scores.