Well, the Marvel's Spider-Man cartoon made him a super-genius on par with Peter who also builds robots, but that show made a lot of characters smarter then they are in the comics to go along with the science focus.
We haven't really seen much of Miles' school life in general outside him hanging out with Ganke and Goldballs.
I think Miles is probably above-average intelligence, but would come off as "normal" compared to the super-scientists of the Marvel Universe.