Not bad on ef! I have classes there. After all, you have to train. In ef, you can book your own courses, and there is a small class system, which is basically a one-to-several class. If you are really busy, you can take a break from school and take classes online. Most of EF's foreign teachers are not parallel imports like some English training institutions, but all have foreign teacher qualification certificates. I think EF suits you quite well ~