Caroline finds out that Max never actually graduated from high school because she failed to show up for a single history exam.
The episode highlights the deep bond between Max and Caroline, as well as the support system Max has built at the diner, proving that her chosen family is more reliable than her biological one. [S3E24] And The First Degree
Although Max’s mother is absent, the diner "family"— Han, Earl, Oleg, and Sophie —surprises Max by showing up at the ceremony to cheer her on as she finally receives her diploma. Key Takeaway Caroline finds out that Max never actually graduated