Thank you for your help, Bostonian. My DS6 is PG and has ~3.5 GE results for math without any instruction. He apparently understood concepts and was able to answer the questions in his own way, even though he hasn't been taught computation. His performance (WISC) results were off the charts. I think ultimately AoPS would be great but he needs to work on skills before he gets there. We signed him up for EPGY (OE) a couple weeks ago and he's zipping through it. Thinking about Beast Academy this fall also. Everyone keeps mentioning Russian Math because it is relatively new in our area.
