lol Yes it is dumb. (just replying to the OP!!)
It was done to me too, but not in such an extreme manner (3rd grade books forbidden to 2nd graders!! OMG!!)
I was forbidden to read The Little Prince by St Exupery as the school librarian said it was for 7th graders. Mind you, I read Hemingway in 7th grade. lol
Then my Mom & I just went to a bookstore & bought it. lol
I'm pretty glad I read it then & there & didn't wait till 7th grade, cause I might have found it silly in 7th grade...
I really liked it at the time I read it...
I did get some books easily from the primary school library later on that I wish I hadn't. Like Bradbury's Martian Chronicles (totally scared me), & another terrible book, & I think the Maid's Tale... (totally not appropriate for 7th graders too, IMO...)
Luckily the 'ordinary' library wasn't so strict... Though I did get one book from there too when I was in my teens that I wished I didn't!!