The visa issued by the language school will be invalid after you graduate from your school, so if you can't renew it during this period, you must go back to China.
And I don't know what the requirements of the school you go to are. In the past, the language school was strict, you must not miss classes, and you were also strict about attendance.
If you go to a language school just for a part-time job, I'll pay the bill for you. I'm not sure about other places. In Tokyo, language schools charge tuition quarterly, which is about 500,000 yen a year. If you add accommodation, you can find your own house for about 30 thousand a month, which is almost as cheap as this. If you add food, clothing, housing and transportation, it will cost at least 30,000 to 50,000 a month. Note that I said the least.
Maybe you'd say that Tokyo's local consumption is relatively high, but it's also a relatively high and trendy place for job hunting. However, since the economic crisis in 2008, the number of jobs has not been as much as before, and you have just arrived in Japan, and your language is not enough, so you can hardly find a job. The hourly wage in Tokyo is about 800- 1200.
Besides, let me talk about your visa. Your visa should be a student visa. If you graduate from school, your visa will be invalid. So if you want to stay in Japan, you must renew your visa before it expires, otherwise it will become a black account. If they are not caught by the police, they will be repatriated once they are found. I suggest that if you really consider going to Japan, don't think about making money, seize the time to attack the language, find a part-time job, don't choose a job, at least keep a basic balance of payments, and don't skip classes to work because of trivial matters. In the long run, language is the foundation of your foothold in Japan. When your visa is about to expire, try to find a formal job. As long as a company accepts you, you can turn your visa into a technical visa or other visas. The days of making money really began.
It's always good to know more friends. In addition, don't take crooked ways. It is really lonely to be alone in Japan. Be prepared for hard work.