The honest picture
China's Z work visa process for foreign English teachers has, in most provinces, required applicants to be a passport holder from a country widely recognised as having English as the majority native language — commonly the UK, USA, Canada, Australia, Ireland, New Zealand and South Africa. Nigeria has not typically been included in that list for the standard teaching Z visa route.
This is a structural visa policy issue, not something a TEFL certificate, degree, or interview performance can override. It's important to know this clearly before spending money on a course marketed at the Chinese teaching market specifically.
