Are many companies in Suzhou that study Yijing and Sinology formal?

It's basically official. For example, Suzhou Dexin Yixue Company, Suzhou Tsinghua Deyue College and Suzhou Dawang Yixue Research Institute are all formal, with formal registered capital and qualified qualifications, and are required to abide by some laws and regulations of government departments. The Book of Changes is an ancient classic that explains the changes of everything in the world and a profound dialectical philosophical work.