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This study investigates how access to extracurricular resources predicts math achievement among U.S. 15-year-olds using the 2022 PISA dataset. Grounded in Piaget’s cognitive development theory, Gardner’s multiple intelligences, and Vygotsky’s sociocultural theory, it explores the interaction of home-based resources with socioeconomic status and gender. Hierarchical multiple regression, applied to a weighted sample of 4,552 students using plausible values and Fay’s BRR weights, revealed that musical instruments, video games, ICT, and parental education & occupation explained 19% of the variance in scores. Extracurricular resource access significantly boosted outcomes, with girls benefiting more from music and boys from gaming. The findings underscore equity gaps and call for targeted policies supporting resource access in home learning environments.