If your parents and everyone you're around to as a child have very limited vocabularies like many black people did being slaves and it being illegal for them to be educated it's not surprising they're vocabulary to be limited and this is passed on to your children it doesn't mean you don't have the capacity to score high on an IQ test it just means you don't have the answers to the questions. The only thing that the IQ test for dicks with really good precision is how well you'll do in academic settings.