There students work hard in thier schools. Olympic in Spain, that's the main subject for all grades in the schools at the time. I've heard they continued for a month about that subject. In Japan, even if there held Olympic in Japan, that is not our main subject for schools. I though at the time, In New Zealand, what students learn or to do are the main subject to have to study.
Teachers help students learning.
So if Brazilian students came from Brazil and stayed in Japan, and go to Japanese school, there are many problems than the other countries, I think. In my international class, I teach Japanese language from beggining and kanji writing and reading and writing Japanese letters or so. Fortunately we are abe to get financial support from city government. So I can buy things for their Japanese lessons. But maybe there are few to get these things for students another schools in Japan.