Recruitment policies vary significantly between international schools, so you need to make sure you are in an advantaged position and actively check their policies. Some international schools are quite strict in employment, and only accpet qualified teachers with enough experience, while others are willing to hire teachers without the correct credentials.
Generally, employers prefer teachers with the following qualifications:
Teaching experience greater than three years, preferably with the same employer.
Relevant teaching jobs in shanghai international schools
or foreign language school, and extensive experience in an environment with multiple English learning needs.
Relevant Certification/qualification from the USA, Canada, UK, Australia, or New Zealand.