The father wants the daughter to change her class. He wants her in a class with a teacher who is nice and gives exams his child can pass. The daughter wants to stay with her current teacher. She doesn't like him, but knows he is a good teacher and knows that by staying with him she will pass the regents (and subsequently the class) in the end. She knows she is learning even though her grades don't show it. Last year she had a teacher who babied her and she learned nothing.
I understand the father wants only the best for his child. In this case, does father really know best?