I can see several problems with using this method. In reading through the test questions, I often had questions about what was meant. If you are looking for assistance in diagnosing possible learning disabilities, you would be better off finding someone in your local community who will do one on one testing with your child and set up a truly individualized program for them if that is needed. The pre-qualification test on this site may lead to some insights for you, as will reading through the batter of 8 tests offered for free on the site. The PASS test was developed specifically for homeschoolers.
Parents administer the test at home.
It is untimed. Results show your child's overall achievement and include suggestions for reaching goals in each assessment area. P.O. Box 9, Washougal, WA 98671. The CTBS tests all academic areas including Reading, Language Arts, Spelling, Math, Science, Social Studies, and Reference Skills. The Gates-MacGinitie Reading Inventory tests reading skills, vocabulary development, and comprehension only.