80s or 90s high school film
i think these scenes are near the end (in no order)
dog with sign around its neck and a man decides to take him home (possibly was his dog)
a voiceover with 'the teaching is creative' and there was a shot of a teacher encouraging the students to move their desks around her in the middle.
something perhaps with a student becoming principal (?)
i think the conversation is over the pa system.