Can I use a fake teacher recruitment approval certificate?

You can't. It is illegal for teachers to agree to apply for the exam, and it is illegal to use fake ones. If you are seriously suspected of committing a crime, you can't use fake ones. The proof that the teacher agrees to take the exam refers to the proof that the employer agrees to take the civil service exam. When an on-the-job employee of a unit signs up for the civil service examination, the unit must issue a consent form, that is, a valid written certificate that allows the employee to take the civil service examination.