Jake's Learning Rate

[Neytiri.]

I think him learning na'vi so quickly would be dificult, but not if you were constantly with people who spoke it fluently.

and as to the other things, He's a marine, I doubt he would have any trouble learning how to hunt or move through the jungle efficiently. He actually fought in the jungle on Earth. It's not that difficult to use a bow and I'm sure he picked it up as quickly if not faster then anyone else would who is dedicated to something.

Learning to fly an Ikran wouldn't be that difficult either, all you have to do is think and keep your balance lol All in all I think he learned at a fairly realistic level