[vamsipk]

Sure, we can use only GPAs as long as all the applicants are graded on the same common platform. But today the GPA from one college is not exactly equivalent to the GPA from another one. The grading system as I heard is also not standard across US (leave alone international) with some instructors using absolute while others relative grading. So an A student from college X is not necessarily as good as a B student from college Y.