The key lies in your usual accumulation of historical and cultural knowledge and the historical knowledge literacy that a historian should have. Nankai University has a good history major, and there are many well-known historical experts and scholars. In addition to the written test results, the key depends on whether what you say can impress them and whether you can show their talents well in your interview. You can read their academic papers in the school newspaper to learn about their academic trends, or you can ask graduate students, who know the interview very well.
I suggest you go to CCTV's Lecture Room, which is full of historical experts and scholars, and see how they comment on history. If your explanation and expression are half as good as theirs, it should be possible.
If the competition is fierce, don't be sad. You can apply to transfer to other schools. There are many good schools in the central and western regions, some of which are very competitive and some are average, such as Yunnan University, Sichuan University, Lanzhou University and Northwest Normal University.