"Old School" is the 10th book in the popular "Diary of a Wimpy Kid" series by Jeff Kinney. It is a humorous novel focusing on social themes like friendship, with illustrations included. Published by Abrams, Inc. in 2015, the hardcover book measures 8.3 inches in length, 5.8 inches in width, and 0.9 inches in height. With 224 pages, this juvenile fiction novel is an enjoyable read for fans of the series, offering a blend of comedy and heartwarming stories set in the world of a young boy navigating through school and social interactions.