We've just got Descartes' Cove (
http://cty.jhu.edu/ctyonline/cove/index.html ) and I think that has the characteristics I'm thinking of: multistage problems involving several arithmetic steps, so that you have to get them all correct to get the right answer, plus immediate, non-judgemental feedback on whether you have the final answer right or not. Just an example...
Is this a set to learn 6 to 8 math OR is it enrichment? I'm thinking if it's to use for cirriculum he has more depth for gifted in Math. Is this is true?
I'm afraid I don't understand your second sentence, but I'd say it's designed more for revision and enrichment than a thing to use to learn the material the first time. There is a book ("Descartes' notebook") which has some explanation of the topics, but it's quite brief. That said, my DS6 is using it to learn a fair bit of the material for the first time, with help from us on the new material. From the home page you can get to the syllabi it's based on, if that helps. It comes from Johns Hopkins' Centre for Talented Youth, which I think means it's specifically aimed at GT kids. The questions seem to me to be quite challenging relative to the syllabus, i.e. to involve real understanding of it. However, I may not be the best judge since I have no other experience of grade 6-8 maths teaching material, unless you count what I learned from myself.
