This investigation, conducted at Clearfield, Utah, Job Corps Urban Center, attempted to help the Advanced Education Department select and predict the performance of corpsmen who would attempt the General Education Development (GED) test (high school equivalency). Previous selection procedures were cumbersome, confusing, and with a high attrition rate. The specific problems investigated were: nature of relationship between corpsmen educational performance and their demographic-biologic data, test data, and social behavior; satisfactory reading grade level for selecting corpsmen; the Advanced Level of the Stanford Achievement Test (SAT) as a satisfactory predictor of performance on .e GED test; and the contribution of the General Aptitude Test Battery (GATB) in the selection, and whether this warranted its inclusion in the pre-GED selection battery. Of the 319 corpsmen who began the study, 157 completed the GED test with 128 passes. The results indicated that while age was not significant, ethnic group classification was an important factor in passing the GED test. Highest grades completed in school and other demographic-biologic data and social adjustment ratings were neither reliable indicators of level of academic achievement, nor useful in differentiating the successful from the unsuccessful corpsmen in the program. (Author/PT)