We started Beast Academy -- 3rd grade shapes/angles. It's the first time I've seen DS struggle with math. I can't tell if it's the geometry concepts (we haven't done much geometry), the format, or simply that he has to "think harder" than he's accustomed to.
My thoughts are, if you homeschool, use Beast Academy as a challenging supplement to another core math curriculum. For us, Singapore math has hit the spot for challenging without meltdowns:)
We're continuing with Beast Academy as a supplement to the school curriculum (Singapore).
