Doesn't Khan academy work for you? It's the best thing I have found for my kids.
Also, I want a website which teaches me (the parent) on how/what to teach to the kids. For example, Kumon at this age makes him do additions of two digit numbers with speed. I am not sure if doing things fast is what Kumon should be teaching. I am not able to get guidance on whether or not I should concentrate onspeed vs more concepts.