Gifted Issues Discussion homepage Forums Identification, Testing & Assessment Woodcock Johnson and WISC to diagnose LD?

I am calling around trying to figure out where to get my DD assessed (main concern is processing speed/working memory, probably because of ADHD--see my other post about finding good testers), and one place I called charges $1075 to do the WJ achievement tests and WISC IV. I don't know anything about the WJ achievement tests. I already know that DD is scoring well above the 90th percentile on reading/math achievement tests at school. Her main problem is that she's very slow with written work. So would the combination of those two tests give us a good idea of what her problem is (and what accommodations the school should make)? This place specializes in learning disablities and they give those two tests (and only those two tests unless you want an ADHD workup for an additional $400) as part of the package.