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This study investigates how different types of math homework—textbook exercises, exam-oriented problems, and practical tasks—and their combinations affect the math performance of 17,664 eighth-grade students in southern China. It explores whether homework interest and learning interest act as chain mediators. Results from path analysis show that all homework types positively predict achievement. However, the mediation effects differ: the combination of textbook exercises and practical tasks shows a positive chain mediation effect, while exam-oriented problems (alone or combined with textbook exercises) show negative effects. In China, combining textbook and practical tasks may best support student development. The study provides practical insights for designing homework that boosts interest and improves math performance.