DS7.5 is on that track: 6th grade/pre-algebra. It's material he knows, but it is relatively formulaic. On his own he's read through to Algebra 1 in Life of Fred. However our current acceleration is already pretty radical (going to the middle school for period 1 in the morning, then back to his 3rd grade homeroom for the rest of the day). He's only been doing it for a month but similarly he gets 4 out of 5 correct give or take. Typically they're dumb mistakes like forgetting to include the minus sign or something.

We really wished there was more teaching like the LoF books because those included great word problems.

JB