12-year-old student raven standard reasoning test 25, is it mentally retarded?
Not exactly. The standard value of Raven's standard reasoning test is expressed by percentage, IQ and intelligence level are divided by percentage, the test standard score is between 5% and 25%, and the intelligence level is not low. Raven's standard reasoning test was founded by British psychologist Raven in 1938, and it is used to test a person's observation and clear thinking ability all over the world.