The Clarice Bean series by Lauren Child
Amelia’s Notebook by Marissa Moss
The Legend of Spud Murphy by Eoin Colfer
Heads or Tails: Stories from Sixth Grade by Jack Gantos
The Homework Machine by Dan Gutman
Middle School is Worse than Meatloaf by Jennifer Holm
Regarding the Fountain by Kate Klise
Nicholas series by Rene Goscinny
Dear Dumb Diary series by Jim Benton