Koolearn Technology Holding Ltd is a China-based company mainly engaged in the provision of online education courses. The Company and its subsidiaries operate business through three segments. The College Education segment primarily involved in college test preparation, overseas test preparation, and English language learning. The K-12 Education segment offers after-school tutoring courses and courses designed for standardized college and high school entrance exams. The Company launched DFUB courses in this segment which is a location-based live interactive tutoring service. The Pre-school Education segment mainly offers child-friendly online educational contents through the Company's apps and Donut live online English classroom courses.