You do not need to be a native speaker to study our course. Roughly 20% of our students are non-native speakers.
If your first language is not English, you need to show that your English is at a level of C1 according to the CEFR or higher. If you have attended a high school or tertiary institution in which the medium of instruction is English, that is usually acceptable proof.
Otherwise, there are a number of tests of English you can do to assess your English level.
Read more: What Level Should My English be For a TEFL Course?