Good luck - Saxon has their own placement tests I think. We downloaded some directly from their site and placed my DD in first grade (which is appropriate as she was entering first grade) and my DS in 7th grade (which is inappropriate as he was entering 3rd grade.)
Another approach is to add some logic and problem solving skill building rather than advancing directly in math. In the end, math is about problemsolving rather than arithmetic - so it is the best possible kind of enrichment. Enrichment that matters more than the stuff the rest of the kids would be doing.
If they can't do that at school - you can definitely do that at home. Computer games like Zoombinis is a great tool for that.
Mary
