Why international schools are a different market
International schools generally follow a national curriculum (British, American, IB, or others) and are often accredited by bodies that require staff to hold qualified-teacher status — a recognised teaching licence or PGCE — rather than a TEFL certificate. This is a fundamentally different hiring model from language centres, which exist specifically to teach English as a foreign language to non-native speakers using less formally regulated staffing.
Because of this, even a well-respected 120-hour accredited online TEFL, or even a CELTA, typically does not satisfy an international school's core qualification requirement, since these certificates aren't designed to confer qualified-teacher status.
