This study was undertaken in order to study the prediction of first-year grades at Mills College by means of the College Entrance Examination Board Scholastic Aptitude Test and several indexes of the secondary school record. The Scholastic Aptitude Test, the Converted Secondary School Rank, and the Number of Secondary School Recommending Units were all found individually to have moderately satisfactory validity as predictors of success at Mills College. For the class which entered in the fall of 1946, the two parts of the SAT had higher correlations than the other measures with the Total of First and Second Semester College Grade-Point Average. In the 1947 entering class, the two secondary school indexes were slightly superior to the SAT parts in the prediction of the first year's average. However, in the latter case, all the correlation coefficients were rather similar in value. The Number of Secondary School Academic Units showed no relationship in either class to success in college, although it was related to the Number of Recommending Units.