This study was conducted to determine the relationship between the American College Test (A.C.T.) composite score and academic success or failure as indicated by the GPA and state-board licensing examination score of students and graduates at College of Lake County, Grayslake, Illinois LPN program. Subjects were 132 graduates and 34 currently enrolled students, of whom 127 had taken the A.C.T. preadmission test and 108 had written the state-board examination. The first five classes of the program were studied. The college implemented the program in 1969. This corelational study had an ex post facto design with interval measures indicating a parametric correlation technique be employed. The Pearson product-moment correlation machine calculated formula was used. The findings indicated a correlation of 0.438 between the A.C.T. and GPA and 0.542 between the A.C.T. and state-board examination score. As a result of this study, the screening committee for the practical nursing program will have a more valid determination of minimum cut-off composite score on the A.C.T. preadmission test in the selection of potentially successful students and graduates. Major recommendations include a study by the committee of the A.C.T. Student Profile Section for information on other factors which may affect a student's success or failure in the program; development of rating scales for other variables predictive of the strengths and weaknesses of the prospective student; and the screening committee must continually evaluate and improve the procedure for the selection of successful practical nursing students in the future classes. (Author)