What if your teacher is not able enough to teach you?
How will you show your reaction in these circumstances? Will you prefer some soft reaction or a harsh one? One option available to you would be to stay silent and do nothing but I do not think it would be a better decision doing so.
You can consult the admin of the institute and discuss the issue with him. One option is to discuss the issue direct with the teacher but I would not recommend this option. We should not humiliate the newbie teacher in any way.
So, what will you suggest if someone is facing the same situation?