My oldest started school reading chapter books. At 5 he was also a summer birthday boy so expectations were not high. He blew them away with how quickly and easily he learned. So in K they taught him to play chess. In second grade he was formally identified because he was reading at least 2 years ahead and was at least 1 year ahead in math (that's school criteria).
My younger son was identified in first. Also several years ahead in reading and math. I am curious whether they are just bright students or Gallo to gifted. My boys are opposites in every way except are both exceptional students and are both left handed. It's interesting. If I ask for IQ tests what reason do you give?