Key points are not available for this paper at this time.
Julian R. Betts, Darlene Morell, The Determinants of Undergraduate Grade Point Average: The Relative Importance of Family Background, High School Resources, and Peer Group Effects, The Journal of Human Resources, Vol. 34, No. 2 (Spring, 1999), pp. 268-293
Betts et al. (Fri,) studied this question.