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We then introduce a novel classification framework for prerequisite relation learning methods based on both feature types and enhancement relationships, categorizing existing approaches into four types: (1) multi-source knowledge features for KCs\u2019 prerequisite relation learning; (2) semantic knowledge features for LOs\u2019 prerequisite relation learning; (3) LOs-enhanced learning for KCs\u2019 prerequisite relation learning; and (4) KCs-enhanced learning for LOs\u2019 prerequisite relation learning. The survey highlights recent developments in modeling KCs\u2019 prerequisite relations. We provide a comprehensive analysis of evaluation methodologies, including both intrinsic metrics and extrinsic evaluation. Furthermore, we analyze the practical impact of prerequisite relations in educational applications, from adaptive learning path generation to curriculum design. 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