Kim Ung-Yong has a verified IQ of 210.
With a verified IQ of 210, Korean civil engineer Ung Yong is considered the master in child prodigy. At the age of 6 months he was able to speak and understand Korean and other languages. At the age of 3 years, he could read several languages already, including; Korean, Japanese, German and English, as well as solve complex calculus problems as exposed live on Japanese television. He was listed in the Guinness Book of World Records under “Highest IQ”.
https://www.wonderslist.com/10-most-intelligent-people/