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The Kahn Academy is quite extensive, and in my experience of high quality. It is partitioned by grades (kindergarten, 1st, .2nd, .., 8th), and by topic (arithmetic, geometry, pre-algebra, etc.) It has a nice interactive interface, practice questions and levels. A student can have a personalized dashboard. They've now branched out to Economics and AP-Biology ...


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Beast Academy is wonderful. It goes from a level 2 to a level 5, but those are higher than U.S. grade levels. Also, I have some of my favorite books listed at my blog.


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