the whole school; all students and staff
Refers to the entire school as a collective body, including all students and staff. Often used in contexts like school assemblies or announcements.
全校集会は体育館で行われた。
The whole-school assembly was held in the gymnasium.
all schools; every school
Used when referring to multiple schools collectively, such as in regional or national contexts.
県内の全校で防災訓練が実施された。
Disaster drills were conducted at all schools in the prefecture.
The whole school held a sports day together.
The principal informed the whole school about the typhoon.