MAP data is useful, but I don't think you can base your math instruction on the scores, even the subscores. For math, our reports provided an overall score and five subscores, Algebra Functions, Geometry, Measurements, Statistics & Probability and Number Relations/Computation. The test for the math section is maybe an hour (probably shorter for a K student)and on the computer. A decent school district's math curriculum would be far more comprehensive as well as involve substantial writing/mini-proofing by second grade. Personally, I woulnd'nt be comfortable basing math placement on MAP scores even at the 90+ percentiles.
I think you need something that is comprehensive and list by topics/sub-topics. Aleks is pretty good in that regard. However, even there, I would not necessarily assume that mastery of all the Aleks content equates to mastery of your school's curriculum. At least for my 4th graders, the school curriculums, particularly for the GT classes, cover more than Aleks plus is very heavy on writing and explaining (mini-proffing) beginning with 2nd grade math. I would make sure than the writing/explaining parts are covered in your homeschooling in case you wanted to send her back to a brick and mortar school at some point.
