The written agreement of Tianjin Zhi Ding Education is good. According to relevant public information, the written agreement of Tianjin Zhi Ding Education is superior to no refund in terms of preferential policies. Students with written agreement on Zhi Ding Education can make targeted improvements between written examination and interview, increase the chances of passing the interview and enjoy certain fee concessions. Non-refunding can force students to study harder and ensure the income and stability of training institutions.