Because prisoners are often denied a chance to take the General Educational Development (GED) test because of low scores on the General Education Performance Index (GEPI), a study was conducted to determine whether total standard scores on the GEPI of 220 or greater could be used to predict total standard scores of 220 or greater on the GED test. The total standard test scores of 118 inmates who had taken both tests were used. Scores were categorized into three groups: (1) both scores above 220; (2) both scores below 220; and (3) one score above and the other score below 220. Categories one and two were considered correct predictions whereas category three was considered an incorrect prediction or expectation. A Z-Test of proportions was conducted on the total standard scores. Results, confirmed by chi-square analysis, showed that the higher the total standard score on the GEPI, the greater the chances for GED total standard scores to be correspondingly higher. A total standard score of 240 or higher on the GEPI yielded GED scores of 225 or higher (220 is passing) in 84 percent of the cases. The study recommended that 240 or higher on the GEPI should be used as the cut-off point for allowing inmates to take the GED. (17 references) (KC)