A series of events are being held during the day to remember Keane Wallis-Bennett, 12, who died after a changing room wall in the gym collapsed.
Head teacher Stephen Kelly said the "incredible strength and support from the local community" following the tragedy would also be recognised.
Mr Kelly said Keane was "a lovely girl" and "an excellent pupil".
Assemblies are taking place at Liberton High in Edinburgh a year after a pupil was killed when a school wall fell on her.