I would ask his teacher how he's supposed to do this because even when it was taught in school it wasn't taught until Jr. High, 7th grade, and then it was just part of a semester. I really didn't learn how to type well until I was an adult and found that I liked typing. I still type a lot of words per minute and am almost always perfect. I taught myself.
I think his teacher should be aware of this. She/he should be aware of online programs he can do where it's more like a game that he gets credit/scores if he types correctly. This will make it more fun for him and less work. It will also become second nature to put his fingers where they go.
No one teaches typing anymore, they call it keyboarding now. It's always part of their computer classes.