My GPA is incredibly mediocre. I don't really think one's GPA is actually a good measurement of their intelligence. So much of doing well in school has to do with how lazy a person is. So many classes don't actually involve thinking; just mind numbing memorization of facts and showing up with your homework complete. That doesn't really take any intelligence. I'm not saying that people who get good grades are always stupid - a lot of these kids are quite sharp. However, I know some pretty dull and stupid induviduals who manage to do well because they happen to be organized.
I like to think I am pretty smart, although I'm hardly omniscient.