You get goals and tasks to complete during the school day, similar to the active careers in the Get to Work expansion pack.
Sims can build specific skills while at school based on their classes (e.g., Logic, Writing, or Fitness). Mod – Playable School Events by KAWAIISTACIE
Since this mod uses the active career system, you generally need the The Sims 4: Get to Work expansion pack for it to function properly. You get goals and tasks to complete during