The arrangements at DDs school are chaotic. All 4 classes have to line up in a space that isn't big enough to accommodate a line of 30 pupils and there are up to 120 parents crowding around this cramped space. The teacher blows a whistle and then each line is led into a shared corridor so the pupils can hang up bags and coats and then they go into their classrooms via the internal door, off the corridor.
DD started school at a different school and the arrangements were much better. The pupils entered the classrooms via their individual (exterior) class doors. They did not have to line up but were able to stand with parents, outside the door, until the teacher was ready for them to come inside.
I am wondering what is the norm.