Is "Volunteer Guidance for Centennial Yucai College Entrance Examination" reliable?

Very reliable, but the most important thing is to look at your own discretion. Volunteer guide can only be used as a reference.

Centennial Yucai has set up branches in Dalian, Shenyang, Harbin, Changchun, Tianjin, Xi 'an, Shijiazhuang, Zhengzhou, Taiyuan, Qingdao and Jinan. Centennial Yucai has branches in more than 40 cities across the country, including Dandong, Liaoyang, Jinzhou, Tieling, Haicheng, Qinhuangdao, Datong, Lianyungang, Dongying, Heze, Longkou, Weifang, Binzhou and Zhucheng, with master's degree or above accounting for 15% and bachelor's degree or above accounting for 63%.