Explain the learning material to someone else, then you are actively engaged with it. By explaining the learning material to someone else, you actively retrieve information. You think about the material again and then store it even better. In this way, you not only help your classmate but also yourself! For example, arrange with a classmate after a lesson or before a test to explain the material to each other. Supplement each other afterwards when there is missing material in the explanation.
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Galbraith, J., & Winterbottom, M. (2011). Peer‐tutoring: what’s in it for the tutor?. Educational Studies, 37(3), 321-332. https://doi.org/10.1080/03055698.2010.506330
Koh, A. W. L., Lee, S. C., & Lim, S. W. H. (2018). The learning benefits of teaching: A retrieval practice hypothesis. Applied Cognitive Psychology, 32(3), 401-410. https://doi.org/10.1002/acp.3410