ancienne école

former school

→ ancien
phrase Rare #46,216
former school Here, ancienne means a school someone attended in the past, not necessarily an old-fashioned school. The adjective agrees with the feminine noun école.
FR: Mon ancienne école est devenue une bibliothèque.
EN: My former school became a library.

Il n'y a rien sur votre ancienne école.

There is nothing about your old school.

— À bout de course (1988)

Mon ancienne école a brûlé, les dossiers ont été perdus.

My old school burned down, the records were lost.

— À bout de course (1988)

Je me demandais si Michael t'avait déjà parlé de son ancienne école.

I was wondering if Michael had already told you about his old school.

— À bout de course (1988)