I have to say, the level of the books was very accurate. I had a child working several years ahead across the board and I flipped through all the books and decided to get the correct grade level. the challenges are abstract enough that it was sufficient. Then when we were approved for a grade skip, we went with the skipped grade level and it too, was spot on. It's not like most workbooks where you need to buy the grade level several years ahead. Being a gifted book, it assumes the child is working ahead of level already. I would see if you could look at one at Barnes and Noble and see for yourself what would work best. It would depend on the child. If that isn't possible, go with one grade ahead of current, maybe, and if there are sections that he can't do, save them for later.
