This research, conducted at a university in South Texas (87% Hispanic), investigated how well pre-service teachers' performance on the Secondary Professional Development Examination for Certification of Educators in Texas (ExCET) can be predicted. The linear regression equation explained 51% of the total variance in the ExCET scores while the logistic regression equation accurately predicted 80% of the overall pass/fail status. This study concludes that English language skills contribute enormously to the success of Hispanic pre-service teachers on the ExCET and suggests that school districts ensure that students develop these skills. The methodology used in this study is applicable to certification tests in general. (Contains 7 tables.)