My school was mixed but with areas separated by gender. In the junior school classrooms were mixed but no senior school. A corridor separated the two areas, and areas were as a nursing, secretarial, library, and the offices of the director and assistant director.
Although there were hours to dispense with unruly students, morning recess, the desktop or in the evening, after classes, anyone could be sent at any time, even during classes, to receive corporal punishment.
When you were sent to receive corporal punishment thing you wanted wasn’t to meet someone. This was inevitable if you sent at set times, by joining the two rows of girls and children. Older children looked you deeply, making you feel humiliated to see how you smiled knowing what would happen in a few moments in the office of the assistant director.