DS came home with basically the same books from the school library for 3 years (JK, SK and grade 1). At one point I asked him why and he said he was only allowed to pick from a limited section which were all baby books so he stopped looking. They never did book reports on those books or anything so it didn't matter that he never read any of them. We had more pressing issues so I never brought it up.
Last year they finally let him take out a book from anywhere in the library. It was like Christmas day!!!! He was so excited to be allowed into the non-fiction section.
During all of this we just went to the public library. That and he would dig through our bookshelves at home. He would often make us read our old university physics books for bedtime stories.