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An IQ score of 85 means that your child has dull normal intelligence. In order to raise your child's IQ score, he will have to study. Most IQ exams test individuals in areas like math, general knowledge, and science as well as logic/reasoning, visual-spatial skills, and other areas as well. They cover the basics of math like addition, subtraction, multiplication, and also delve into algebra, geometry, and higher levels of math.