Abstract
In this paper, we explored the problems of education DX in high school as a case study based on the online lessons actually conducted at our school. The method of conducting online lessons is a) sim-ultaneous interactive type using Zoom, b) video distribution type using YouTube, and c) text-based distance lessons. In addition to digital divide problems such as environment and individual skills, we clarified the student’s overburden that hinders the integrated enhancement of collaborative learning and individual optimal learning.