A novel by Daniel Pinkwater, although at ~100 pages I suspect that the correct term would be a novelette. John#2 has done a pretty good job reviewing it, but I think that a few extra notes are in order.
First off, I should mention the first chapter -- don't get scared off. Young Adult Novel starts with a chapter from Kevin Shapiro, Boy Orphan, which is a dark and depressing story. We revisit the unfortunate Kevin from time to time, but Young Adult Novel is not a dark book. It is, in fact, a fun story about four slightly obnoxious and rowdy kids, who happen to think that killing off Kevin is fun. However, it may not be entirely appropriate for younger readers. As a litmus test, consider the brief mention of Kevin's sister running off to become a prostitute; if explaining what a 'prostitute' is does not worry you, your youngster is ready for this book.
This is closely related to the second point: this book is not like other Pinkwater books. It is somewhat silly, but only because the subject of teenagers tormenting their peers and teachers with Dadaism is inherently funny. There are no fat men from outer space or giant chickens here. This is much more a Gordon Korman type of story (one of his earlier books, like A Semester in the Life of a Garbage Bag). I suspect that any Pinkwater fan will enjoy this book, but it may not be what you were expecting.
As with so many Pinkwater books, it is no longer available except in used bookstores and in the collection 5 Novels.