The whole point of Schoolastic is to provide reading material for students. It also pairs up with schools and teachers to not only pick a book based on the topics but provide the school with enough copies of said book. That all being said usually when you're in middle school or elementary they use books set by the school board for their area. Some also use chat forms with teachers from everywhere else around the world. Schoolastics the only one that's professional and chosen by your teachers.
The words from evening that most strongly suggest the theme would be : Then, and then only, have i thought how sweet/ oldd age might sink upon a windy youth this reflect the theme of past recollection
