My neighbor used to tell me a lot about how her son goes to Kumon, a learning tutoring center that helps kids advance and challenge their learning skills.
The center itself costs too much for me, so I was glad to see that they had Kumon workbooks available on Amazon.
Yes, even my little 3 year old has nightly homework. She’s excelling well and almost done with her Colors book, which also includes a mini maze that challenges her motor skills. She learns how to identify her colors, and use her motor skills to color and guide.