Yes, 大英自主学习-教师端 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.
大英自主学习-教师端 is free.
To get estimated revenue of 大英自主学习-教师端 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.