Foreign students, the Pioltello case is (almost) the rule - Exam time. In one class out of 15 they exceed 30% of the total (ANSA) At a national level, 6.8% of classes - approximately 1 in 15 - have a share of foreign students greater than 30%.
With a further peak of 11.2% in primary school. “Pupils of non-Italian citizenship represent 10% of our school population: 872,000 students who clearly don't bother to distribute themselves evenly"