Yes, 二建题库 is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
二建题库 has several in-app purchases/subscriptions, the average in-app price is 360.11 r.
To get estimated revenue of 二建题库 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.