How about Guangzhou Institute of Biomedicine and Health, Chinese Academy of Sciences?
This exam is not difficult, it is divided into two parts: chemistry and biology. I don't know. Some biological tutors can compare with Knibbs and SIBS, but they are not bad at home. But it's best to ask the tutor if there are any candidates or something before the exam. The treatment should be the average level of Chinese Academy of Sciences, but not much. The location of the institute is very biased. In Guangzhou Science City, there is nothing around except factories and crops. It's a good environment, and it's good if you devote yourself to academics.