The main objectives of this study were: (1) to determine the degree to which SAT scores and high school grades were effective in predicting the freshman grades of disadvantaged/minority students; (2) to examine the validity of these same predictor variables for subgroups of minority freshmen formed on the basis of sex, ethnic background and "risk" admission status; and (3) to determine if the use of a common white regression equation for minority students either over or underpredicted their actual performance. The data was obtained from 200 minority students enrolled in the 1968 Educational Opportunities Program (EOP) and in the College of Letter and Science (CLS) at 2 University of California campuses. These data were cross validated with findings observed for entering 1969 EOP groups, and randomly selected control populations of over 600 CLS freshmen were added for purposes of comparison. The results showed that the high school average was the best overall predictor of college grades for both minority and white freshmen. SAT-V was a more consistent positive predictor for white than for minority students. Minority and white female SAT-V correlations were generally higher than those for males; and the predictor variables correlated poorer for EOP "risk" groups than for other groups. (Author/AF)