The question is, how can I come to Japan for an exam without going to a language school? First, you have to solve the visa problem. It takes a long time from registration to examination, to qualified publication, and then to applying for a study visa. I can't do anything without a visa these days.
Waseda liberal arts tuition is about 654.38 million RMB a year. But there are many scholarships that international students can apply for.