I am not sure about the levels of giftedness or delays for these kids but my DD was in a yr3 class of 22 children which had at least two kids in G&T extension and I think more than 4 receiving special Ed support pull outs. There was one child who was freshly arrived from China and had ESL pull outs. If there were any kids with ASD issues they were mild and no downs. One teacher, no aides, but our teachers are well supported. The classroom is heavily differentiated and we were very happy. But I can imagine it being a disaster too depending on the teacher or school, and the level of giftedness or delays at play.