i think it really varies by school, and sometimes by individual teacher.

my kid (5) is LIVID that her school prohibits toys from home, yet other families break the rule all the time with impunity... the school she'll join next year has a looser policy (by class, based on how the kids handle it) - i feel like that'll work better for her... although i'm sure we're probably in for a rousing chorus of "they ruined it for EVERYONE" at some point!

Every Sunday it brooded and lay on the floor. Inconveniently close to the drawing-room door.