Thank you for that information. I will continue to homeschool, and yes, I typically buy a "package" of math and languages arts for a particular grade. DS is disciplined and self learning with this method.
I guess I am trying wrap my mind around what is means to go "faster, broader, deeper" in various subjects. We already do the broad approach, and since he is a fluent reader he goes as deep as he wishes on any topic. It's the faster that scares me. But I feel some form of acceleration is needed based on my research, his attitude, and recent testing.
Maybe I just need someone to pat me on the head and tell me it will be okay whatever we decide.