The question bank in the early stage of this kind of institution is still acceptable, because it is found that it is not profitable to be a question bank. In recent years, they have started major online course optimization marketing. These years are not particularly good for the question bank. You can go and see the bad reviews of the APP.
Some questions are brushed for free, but good content is generally charged. In particular, some questions are not analyzed, especially some required questions or simulation questions need to be charged. It is really a good harvest for us, not to mention the information about them.