1-Are you getting along with your little friend here? It´s your friend/are your friends nice? Etc (among a lot of other ways)
2-Do you get along well with your teacher?
This is one way, but there others as well, with a kid you would perhaps just say do you like your teacher? Is she/he funny? Etc. Those questions may change with the age bracket of the person you address. In the case of children of tender age, asking if she is funny etc, it´s not exactly asking if they are getting well, but a way to break the ice (make the kid talk), as a parent usuallly does, prospectively and not directly.
3-One possibility would be to ask "what about my child? How is he/she doing?"
The way you meant suggests something else -even in Portuguese - that the teacher should adjust to your child learning style, etc. Not a good way to win one´s friendship!