What does the Dedao experimental class mean? After-school training class?

It's not an extracurricular training class. The full name of Dedao Experimental Class is SIVA Dedao Experimental Class, which is the collective name of educational cooperation between school of visual arts and Dedao. The students are all undergraduates. Different from ordinary classes, the teachers in Civade Road Experimental Class are masters hired from abroad. In addition, the students of SIVA Dedao Experimental Class, like other majors in school of visual arts, all receive full-time four-year undergraduate education.