Secondly, different majors have different requirements. Liberal arts and science and engineering disciplines are definitely different. First of all, I don't know your major and I can't give you an answer.

Japanese n 1 level is necessary, and most research subjects do not require n 1 certificate, but the entrance examination must be n 1 level to complete the examination, and n2 is basically impossible. Graduate students can n2, but it depends on the opinion of the tutor.

As for English, most research subjects don't need TOEFL. For example, engineering research subjects have their own English tests, which are as difficult as TOEFL or even more professional. So, get or reach the TOEFL in advance? ibt？ More than 80 points is ok. Other individual tutors directly ask ibt? 100 or something.