Such remedial classes abound, but it is better to choose responsible teachers. Some in-service teachers simply want to make money, regardless of whether you have learned anything or not. Besides, there are several English tutors in Guangzhou, such as Zhuo Yue and New Oriental, which are extremely expensive anyway. In fact, teachers are not as ignorant as they advertise and teach others. My cousin studied machinery in one of them (not to mention which one), and paid more than 1000, and learned nothing. If you want to go to a small class, it's really useless to go to a large class. Learning is equal to not learning. If you go to a small class, you can recommend a cram school in Cai Ying. Good luck!