Sentence:  If a child with an <WSD>I.</WSD> Q. of 120 scored 5.5 in achievement , his discrepancy score would be + .7 , representing .7 of one year of over-achievement . 
Meaning of the word marked with <WSD> tags:  a measure of a person's intelligence as indicated by an intelligence test; the ratio of a person's mental age to their chronological age (multiplied by 100)