Horrible Harry in Room 2B is a good book to introduce making smart decisions. I would incorporate this book in my 3rd grade class during the first week of school. Following an integrated lesson on rules and appropriate behavior, we would read what it is like to have a friend that doesn't always make...
Another recommendation from the eight-year-old I watch. Reminded me of The Kids of the Polk Street School books but shorter. Not bad but not my favorite JE series.