They Check your references, contact info, fingerprints, criminal background. Etc they also Check to see if you've ever worked with children before. Have an anecdote or two that demonstrates your skill with children or with working with other teachers.

Unprofessional and disorganized from start to finish. Phone interview, followed by an interview at the school where I would be teaching. Interviewers spent more time chatting with each other than interviewing me -- rude, unprofessional, waste of my time. Did not have answers to simple questions, such as how many hours the position is, starting date, and training information -- leading me to believe there is no organization or leadership whatsoever. THEN, I was not made an official offer, but I was advised to get my background check and fill out paperwork. After wasting an entire afternoon doing that, I never heard another word from my recruiter even after multiple follow-ups. Completely unprofessional.