During December 2024, Juan Perez enhanced the TheCodingForceUPSLP/marathon-quiz-game repository by implementing category support for quiz questions. He updated the data model and persistence layer using C and C++ to introduce a category attribute, enabling questions to be organized and reported by category. Leveraging data structures and file I/O, Juan ensured that category information could be modified and persisted, laying the foundation for future features like targeted lessons and leaderboards. This work improved quiz content organization and enabled category-based analytics, reflecting a focused, foundational contribution with depth in data modeling and persistence, though limited in overall project breadth.