Tutor's introduction and research direction can generally be found in official website and universities, depending on which direction you are interested in. Then find the seniors and sisters you know to understand the tutor's character, work style and so on.
Prepare a resume
Resume is not as formal as looking for a job, but you should prepare your resume carefully. It is convenient for the tutor to get to know you before deciding whether to want you or not.
First of all, you can explain your undergraduate school and major, and those with good grades can be supplemented. Of course, if you have participated in scientific research projects or published relevant papers, you can also write them down. In addition, if your English score is good, you can also stand out in an important position, which is a lot of scores.
Contact your mentor.
You can contact me by email, or you can ask your seniors for the teacher's contact information. Generally speaking, it is better to contact by email. If you want to add WeChat or something, you'd better ask the teacher's permission in advance.
The process of contacting the teacher: greetings-self-introduction-introduction of undergraduate study practice-expressing one's research interest-paying attention to the teacher's related research-following the teacher's desire and expectation for postgraduate study-ending greetings.