This study reports an attempt to determine the nature and extent of relationships between total grade point average and grades in selected courses with ACT scores and the students' status as high school graduates. In general, it was found that the predictors for individual courses were more accurate than predictors for grade point averages. A correlation of about .60 appears to be the highest that can be expected when grades and grade point averages are the criteria. Conclusions include the warning that there is no philosophical reason to expect or desire a high degree of predictability of grades and grade point averages from ability measures. Low correlation coefficients on these measures may well indicate that the college is providing appropriate programs. A low multiple correlation could also mean that there is not a linear relationship between the criterion, grade point average, and the predictors. (JC)