Can teach English till C1 level and prepare for IELTS exam. Can teach to students from all age groups

I am a Food technologist by profession. But I have a volunteer experience of teaching students from age group of 7-15 (school class 1-6). I am fluent in English language as its my mother tongue. Also, academically having all my courses in English has made it more easy to communicate in this language. In terms of other mode of teaching and communication I can also speak Turkish and German to teach the grammatical concepts clearly.