What are the standards and where is the approval form for books

Middle Township - What are the standards and where is the approval form for books included in classroom libraries? What demonstratable qualities are required to release mature books to pre/teens? Does parent notification include book issues and value to approved curriculum for each book? Are reading books chosen to increase language fluency in a school where only 44% last tested are proficient in English? With thousands of marvelous reads having engaging characters overcoming insurmountable odds, what could possibly justify this book choice? Does its selection display the wise judgment we hope for ?