Yes, 老师课堂学校的乐趣 is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
老师课堂学校的乐趣 is free.
To get estimated revenue of 老师课堂学校的乐趣 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.