Information technology teacher qualification certificate can't be a math or Chinese teacher. The subjects taught must be the same as the subjects of teacher qualification certificate, and only information technology can be taught. Citizens who have obtained the qualification of teachers can serve as teachers in various schools and other educational institutions at the same level and below. However, citizens who have obtained the qualification of internship instructors in secondary vocational schools can only serve as internship instructors in secondary specialized schools, technical schools, vocational high schools or junior vocational schools.