I'm a student of CUHK, so I suggest you don't go to graduate school across majors. If you must cross-major, then I suggest you choose sociology, because both JD and LLM need legal background.
Generally speaking, the materials to be prepared are as follows:
1. Language score: IELTS 7.0+ is the best, and 6.5 is ok, but for students who change majors, a high language score will be better.
2. University transcripts: Generally speaking, the higher the GPA, the better, and the easier it is to change majors. Therefore, try to be at 3.5+, and the worst is 3.25.
3. University Diploma Degree Certificate
4, two letters of recommendation: it is best to find a well-known professor who wants to apply for a major to write.
5.PS, CV: These two parts will also affect your application. If you want to change your major, try to do internships in related majors, which is of great benefit to your application.