The info I found online, if you've not already found it, is here:

http://www.ecasd.k12.wi.us/student_services/assessments/KABC-II.pdf

http://www.pearsonassessments.com/pai/ai/research/resources/interviews/AuthorInterviews.htm

I am wondering if your school system uses the KABC vs. something like the WISC b/c of the high population of low SES kids & minority kids that you mention. The links above indicate that the KABC doesn't wind up with as much variance in scores based on SES or ethnicity as does the WISC.

Study Strategies for Accelerated Learners