CHILDREN are mostly underachievers.When the TERM "learning disorder" is used, it defines a group of disorders characterized by inadequate development of specific academic, language, and speech SKILLS. Types of learning disorders comprise reading (dyslexia), arithmetic (dyscalculia) and writing (dysgraphia).A person with an IQ of less than 20 WOULD be described as having a PROFOUND learning disability. A person with an IQ of 20-34, a severe learning disability. A person with an IQ of 35-49, moderate learning disability. A person with an IQ of 50-70, mild learning disability.