I'll take a look at Chung's book and the PWN site to see if they may be of interest to DS.
I don't doubt that you are correct regarding the Geometry. The reason why I thought it may make a difference was due to posts from some old threads that I read a year and more ago. Some of these posts indicated that with Algebra, their kids were able to get up to around 700 (DS was at about 600 with just Pre-algebra and is now close to 700 with Algebra so that was accurate) and then after Geometry and Algebra 2, their kids moved higher into the 700's. Of course, I now realize that it may be an issue of maturity and additional exposure to problem-solving itself.
