1. Education background: Dazhi Education is a company specializing in the field of education. For the position of head teacher, the educational background is very important, which makes it difficult for the head teacher of Dazhi Education to interview.

2. Work experience: The head teacher hired by Dazhi Education needs to have relevant work experience of the head teacher, and can fully demonstrate his professional ability and practical experience in the interview, which makes it difficult for the head teacher of Dazhi Education to interview.

3. Comprehensive quality: As a comprehensive post, the head teacher employed by Dazhi Education needs to have various qualities, such as communication ability, organization and coordination ability, sense of responsibility and team spirit. This led to a difficult interview with the principal of Dazhi Education.