[Ganjasaurus Rex]

Case 1: It depends on where you went to high school. A 3.3 means many different things depending on your school. They know you're smart enough, and they'll want to know how hard it was to get a 3.3 at your school.

Case 2: Again, it depends. A 2000 certainly does not mean you're dumb, and if you got a 4.0 at a decent school, you're going to be fine. Otoh, if you got a 4.0 at some retard school, it doesn't do you much good.