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I'm hearing and use a wheelchair as I was born with spina bifida.  I've been tested and scored well on parts of the test and not so great on other parts based on which part of my brain is being affected by the disabling nature of the LD's I have.  So, what Jillio is saying is correct.   When testing a population, they must factor in that populations ability to interpret what is on the test and modify the test if necessary, so they can get an accurate assessment of that student's abilities.