TOEFL and GRE. These two will do. There is no hard and fast standard for the scores of these two subjects in Hong Kong. Those with a TOEFL score of 550 or above were also admitted, and those with a TOEFL score of 650 or above were also admitted. The importance of GRE is still below TOEFL. The key is to get in touch with the professor over there. After all, professors always recruit people in the end. If the professor wants you, that's good.
Generally speaking, applying for a doctorate requires a master's degree from the mainland, but it is also allowed for outstanding undergraduates to apply for a doctorate directly. In addition to your English proficiency test scores, you also need a research proposal, two letters of recommendation, and a transcript stamped by undergraduate and graduate schools.