The College Board officially recommends CUCAS on website
The College Board official recommends CUCAS in the section of "Study Around the World".
It says: "In addition to College Board programs and tools, there are many helpful resources regarding application processes for universities in specific regions. We also encourage you to contact university representatives directly for specific application information." And it lists CUCAS as the only one resource regarding application processes for universities in China.
College Board is a not-for-profit membership organization committed to excellence and equity in education. Its mission is to connect students to college success and opportunity.