We always hear this kind of questions "How can I improve my English skills? How can I be good at English?"

If your question is phrased correctly "how can I improve my English teacher", the answer is that you probably can't! You need a combination of two things: A new English teacher but as importantly try and spend time with native English speakers, which is the best way of learning the nuances of the English language. Strangely enough a non native English teacher is more likely to teach you grammatically correct english as they will not have the regional dialect and slang that a native english speaker will have developed!!