Madeinuk, thank you for sharing your experience. It is very helpful. He doesn't have a lot of experience in standardized testing (progressive school that recommended him on performance) and his composite was 17. We were hoping for higher to qualify for DYS since we could use some advice but maybe next time since several scores were close.
I've looked into imacs a little in the meantime. They have an online Elements of Mathematics Foundation course that looks creative and DS likes the concept.
Interestingly, he looked at the pretest for the prealgebra course and said he thought it was too hard. His twin sister just took the pretest and aced it though, so we may do both over the summer.
