2. Make a portfolio. (Try to be as good as possible, in line with the professor's preferences, and you can communicate with the professor through email.)

3. Learn more Japanese before applying and get N2 and N 1 certificates.

The most important thing is to win the favor of the professor you want to apply for. If the professor is willing to accept you, then other issues are secondary. That's all that matters.

If your grades are poor, focus on your research experience when making your resume. Dig out your own bright spots and unique reasons for applying. According to different professors, you should feedback some specific reasons for applying for a professor and make an application letter that can impress the professor. After that, we need to start studying the proposal, which will take a lot of time. On the basis of survey data, it is necessary to communicate with the professor about his preferences and research direction, and it is best to write according to his preferences. Finally, it needs to be translated into Japanese after writing. If you are not good at writing plans, you can do more works that are good at impressing professors.