There are infinite online learning aids. I would suggest pursuing two strategies at once. Apply minimal compliance with home schooling standards (that's element 1). Experiment with various online tools that have nothing to do with state suggestions like brilliant.org and it's 1000 competitors (this is element 2). Something will stick for your kids and provide them with genuine education. Try to invest as much time into element 2 vs element 1 as possible. Education is free now. Accreditation and compliance are not. If your main interest is your children being educated, the best tools are free, and there are enough options that something is going to be engaging. They will be fine. They will in fact be more than fine. Free online tools are enough to give children better educations than have been common for the last several decades, and given the decline of public education, your children will be doing laps around others. If your kids can do anything on Brilliant.org, they are better set than many adults.