Why do law schools use GPAs and the LSAT scores?
The GPA plays an important part in the admissions process because virtually every applicant has one. The GPA is a readily available yardstick of intellectual ability and motivation by which most applicants can be compared. Law schools recognize, however, that grading practices vary from school to school, and that the variation can be significant. The LSAT was designed as another measure of ability, one that tests all applicants in a uniform way. Taken together, the GPA and the LSAT score are, statistically speaking, relatively accurate in predicting success in the first year of law school.