There certainly won't be any mathematical adjustment for top-tier school graduates. I think that a 3.85 from Harvard in Computer Science will fare a little bit better than a 4.0 in History from Arizona State when the students have the same or very close LSAT scores. If you went to a low-tier school and you have a high GPA with a bunch of extras, that helps, ESPECIALLY credible work experience. I think the top-top law schools (Harvard, Yale, Stanford) do give preference to ivy league and top undergraduate institutions only because they have SO many applicants who have 3.9+ GPAs, great LSAT scores and similar activities. It's one of the few discerning factors.