Students at a high school in Chongqing prepare for the national college entrance exam known as the gaokao, May 28, 2019. (Photo: VCG)

Students at a high school in Hengyang, Central China's Hunan province, prepare for the national college entrance exam known as the gaokao, May 28, 2019. (Photo: VCG)

Students at a high school in Taiyuan, North China's Shanxi province, prepare for the national college entrance exam known as the gaokao, May 21, 2019. (Photo: VCG)

Students take an independent enrollment exam organized by Beijing's Tsinghua University in June. Those who excel get an edge to enter the prestigious university. (Photo: China Daily)

Parents of students wait outside a high school in Luan, Anhui province, May 8, 2019. (Photo: VCG)

Students at a high school in Handan, North China's Hebei province, prepare for the national college entrance exam known as the gaokao, May 21, 2019. (Photo: VCG)

A student relaxes while preparing for the exam at a high school in Xingtai, North China's Hebei province, May 20, 2019. (Photo: VCG)