Nankai University didn't drop out. According to the classification information of national colleges and universities in 2023, Nankai University belongs to Grade 9, so Nankai University did not quit Grade 9. Nankai University, referred to as "Nankai" for short, located in Tianjin, is a national key university directly under the Ministry of Education of China, a national "double-class" construction university, and a national "2 1 1 Project" and "985 Project" construction university.