You have to go there and get to know it. There are many such things. Find you a job or an internship, and you will be allowed to go. Many of them are lies. It is true that you are required to pay. There are many in Nanchang. I advise you not to go.
Many of the jobs it recommended were promoters, and some even said that they would give you three interviews with the top 500 enterprises in China, which was a lie.