There are many English training institutions in Zhengzhou at present. I was in the same situation as you. Just choosing a school wasted months. It should be said that each school has different goals, some for exams, some for practical ability, some for large classes and some for small classes. Finally, I studied in Ingrid, because the class time there was arranged by myself, which was more suitable for people working there, and it was a small class, so I had more opportunities to speak. I suggest you go there to find out.