Frankly, children should be able to read by Kindergarten and doing basic math. I already was, and it was a highly unpleasant situation for me when my 1st grade teacher was instructing us on what I’d already learned two years earlier.
I sent my son to school sounding out words and having memorized common words. But by the end of second grade, he could no longer do that. He was guess reading as taught at school. So glad we pulled him out of the pig sty.