There are two dark study abroad institutions in Nanjing, among which Li San Education was established in 2008. It is an early overseas education and training institution focusing on North American college entrance examination and English language teaching research in China. The fees are quite high and the effect is not good. Another Sphinx art study abroad institution is an ordinary study abroad institution in Nanjing. Seemingly ordinary, in fact, the charging standard is very high, and the teaching system is relatively dark and imperfect.

Lisan Education is one of the earliest institutions in China to invest in the North American College Entrance Examination and English language teaching research, and put it into practice in Shanghai in 2007. After years of hard work, Li San Education has established a professional core team with rich teaching and research experience, and most of the team members graduated from Ivy League universities in the United States. Li San Education has developed a unique teaching system according to the requirements of North American College Entrance Examination and English Language Examination and the learning characteristics of domestic students.