Start with the Provincial PDFs, work through the National exams, and if you survive the Preselección problems, you are ready for the IMO Gold. Cuba has proven this path works for decades.
"Cuban National Mathematical Olympiad" "problems" "solutions" pdf cuban mathematical olympiads pdf
The search for is not as straightforward as downloading American or Romanian contests, but the reward is enormous. These problems will break you out of conventional solution patterns. They emphasize clarity, algebraic invention, and deep number sense. Start with the Provincial PDFs, work through the
Cuban Olympiad years are often mislabeled. A file named “Cuban Olympiad 1995” might actually be the Provincial exam of 1996. Cross-reference with known IMO team members from that year to confirm. Start with the Provincial PDFs