If you're really interested in mastering English, you'll think about getting a tutor here on italki. There are so many to choose from, and you can learn a lot just from reading the teaching statistics. I'll bet they don't offer you that at the expensive school where you live.

hi Celina, Your English writing is quite understandable to a native speaker. Speaking is a very different and important skill. There is no way to tell how good your speaking is, unless you try to talk to a native English speaker. I don't know how many hours you have studied for the past year and a half. If you never studied English until a year and a half ago, then you have made great progress. I think it is important that your teachers be native speakers. Many people from the US, Canada, the UK, Australia, and New Zealand are teaching English in China nowadays. If you want to learn English for business, then your teacher should also have experience working in a company in an English-speaking country. Thank you for working so hard to learn English! I hope it brings you much joy and success in the future.