Our school librarian had a restricted access policy initially. I emailed her politely and explained that because she had restricted the kids to a certain section, and then told them to make sure their book wasn't too easy for them, my kid came home with no book. I told her that because he has access to almost any book he wants at home, and has plenty of books at his "just right level" at home, we wanted him to learn to pick books by interest at school. I gave her some ideas of things he was reading at home and asked for her expertise for other things he might like.

She emailed me back and said, "he can pick books from anywhere in the library" and gave me some ideas for him for future selections.

Sometimes, those policies are in place to manage the crowd, and when evidence is provided to show that the policy is unnecessary, the school is happy to adjust for the individual child.