Yes, you must take the TOEFL, and there will be a score requirement. Japanese proficiency, a good school needs proficiency. As for graduate school, I will consider it later if it takes a long time. But now it's time to take a course or learn about your major. Japan has relatives, which is your advantage. You can let relatives know the situation first, and it is better to contact your tutor yourself. China's public universities will be free of tuition or will be halved. Because it is funded by the government, the exam will naturally be more difficult than the private one. Examination subjects depend on the school. You can go to the website of the school you want to go to. The cost of living in Tokyo will be much higher, but there is a policy of allowing international students to work, so you can bring the first year's expenses first, and 50 thousand should be enough. Juniors can apply, but seniors can't. Time will be tight. You can prepare for TOEFL and learn Japanese well. Language is really important. To work in Japan, it is advantageous to be good at Japanese.