Mathematics China Mathematical Modeling Network Challenge is sponsored by Inner Mongolia Mathematical Society, an official organization. Co-organizers are Global Competency Certification Center and Fifth Dimension Company. It should be a private organization. Mathematics China Forum is just a media platform.
This competition is quite good, and more and more teams are the best proof. If you want to participate in the national and American competitions, you can still consider participating, which will help improve your level. In addition to online challenges, there are four regionals during Labor Day. Northeast, North Jiangsu, Central China and East China. These are jointly organized by universities and mathematical societies, and they are also highly authoritative.