The question assumes the state is at fault and the fault is not providing enough funding. In reality, the fault can come from many sources: students (which aren't literally children); parents; foreign, national and local political influence; teachers and other staff and association members; the broken windows theory; lack of old-fashined values and discipline?
You can provide the same X euros per year of funding for each student of each school and end up with widly different results.
You can provide the same X euros per year of funding for each student of each school and end up with widly different results.