It’s a huge country and there are a lot of public schools, so you see a lot of variance. They all (99% anyway) have the funding and infrastructure to be fine especially large cities. The problem is large swaths of parents who don’t get involved in their kids education or behavior at all, and those kids become a nightmare for teachers and other students to the point where it becomes a safety issue. It’s always in poorer areas of mostly cities. You can throw all the money you want at those schools and it won’t work because too many of the parents are just trash.