The phrase "school halls" refers to the corridors or passages within a school building where students and teachers move between classrooms, offices, and other areas of the school. Full definition
Fill bulletin boards located in school halls with messages that promote upcoming events, extracurricular activities like sports and clubs, and other school activities of interest to parents. (educationworld.com)
There were accounts of online bullying, or being followed down school halls and accused of terrorism. (gse.harvard.edu)
This can include school halls or, especially, the school grounds. (qaeducation.co.uk)