There are only a few famous Japanese schools, including Tokyo University, Kyoto University and hitotsubashi university. Private Waseda University and Yingqing University. If you want to study economics, you should choose hitotsubashi university, the best business school in Japan. Education is best to go to Dongda and Kyoto. It would be great if one of these universities could attend.
It seems that you don't know anything, so go to the study abroad agency for consultation. It's free and the staff will make it clear to you.
At least the state and the people don't know, and I told you to consider the issue of funds. Private universities are expensive. Even if I went to the state, I said that my family was poor and had no money. Then what are you doing in Japan? Working can make money, but how much can you earn? Just a little living allowance. Japanese undergraduates cannot apply directly. You must study in a language school first. There is no economic foundation. I don't know if you are going to Japan to study or do odd jobs. N 1 is not directly related to tuition. Why do you study business if you are not good at math? Even if you are poor at math in China, you won't report to the Department of Economics and Management. I suggest you don't go to Japan, especially Tokyo, where people have fallen. You should discuss the financial situation of your family with your parents, and it is best to rely on your own achievements, such as a full scholarship in the United States. There is gold shining everywhere.