For students looking to practice with past papers, several high-quality collections are available in digital format: Cuban Mathematical Olympiads (2001–2016) : This definitive book, available at the AMS Bookstore AwesomeMath
There is a unique aesthetic to the Cuban mathematical tradition. Unlike the rote, volume-based drudgery that characterizes some competitive systems, the Cuban style has historically been born of scarcity. In the “Special Period” and the decades preceding it, where paper was rationed and textbooks were relics of a pre-revolutionary past, mathematics became an art of the mind. cuban mathematical olympiads pdf updated