Sun Yat-sen University can choose advanced mathematics in all directions. That is, political English+general psychology+research methods (or advanced mathematics)
Generally, the score of higher mathematics is relatively high, because mathematics can approach perfect score, but the research method is difficult to approach perfect score.
Therefore, the average score of people who choose high numbers in the college entrance examination is slightly higher. Of course it's not significant, but it's always higher.
If you want to gain an advantage in advanced mathematics, CUHK is a good choice.