My DD9 used ALEKS for Levels 3 and 4 without problems. Then by level 5 and into 6 things went down hill. She got more and more disgusted with the program and it became a fight to get her to do it, so we stopped. We are now using EPGY instead.
We gave up ALEKS with my DD part way through 6 and are now doing grade 7, Holt Mathematics Course 2 at a very quick clip before Course 3, which is prealgebra at our local PS. My DD seems to be doing really well with it so I would say you could easily skip forward. In our PS the sixth grade was the same across the board (course 1). Advanced students then did prealgebra (course 3) in 7th then Algebra in 8th. The regular students then did course 2 in 7th and prealgebra (course 3) in 8th. My DD does well in math but doesn't enjoy math so we are taking the longer route.
We are finding some topics in EPGY that weren't covered in ALEKS.
