You should have studied mathematics when you were an undergraduate. The entrance examination subjects for medical postgraduates include physiology, pathology, biochemistry, diagnostics, internal medicine and surgery. In recent years, the topics are getting closer and closer to medical practitioners, and we can't just memorize them. A medical undergraduate with 300 points and more than 220 points is considered excellent. And English and politics. Your academic system is four years and medicine is five years. Your preparation time is insufficient, and your advantage is not obvious.
I wonder if you are interested in bioengineering. Medical teachers in this major are interested in candidates who have mathematics subjects during the postgraduate entrance examination. Immunology is still more inclined to serve the clinic. You'd better contact the tutor you want to take the exam in advance. You can find your tutor's contact information on the school website. Just email the tutor directly. Teachers of Nanyi Medical College send emails quickly, and there are many good teachers. I really want to be strong, and it is not far from Nanjing. I can interview the teacher myself, and there will be good results.
Wish you success!