... I think I really just need scores with percentiles and grade level equivalents, no?
If you do a websearch on Woodcock Johnson III you can see the free public website of the test company. You may want to compare and discuss with the potential test administrator what each score report contains (Complete test? Achievement Test? Just Reading & Math?)
Here's a link to the
qualifications page. The WJIII Cognitive Battery is listed. You may wish to verify this is the same version of the WJIII you plan for your ds to take.
You'll want to be sure the test & score reports will meet your needs.