Most of my friends kids were reading at 3rd grade or better by the time they entered kindergarten. They were also proficient at math to 3rd or 4th grade
Level by first grade. By eight grade, if I had anything to do with it, they were proficient in algebra and geometry, and understood the basic concepts of calculus.. the reading took the investment of a few trips to the 99 cent store
That is until the federal government and state government dummied down education (especially for the students that were excelling) with the Common Core Curriculum.