Parents have a MUCH more profound influence on children than teachers do.
Send them to public school if you must, but when they get home YOU contribute to their education. Don't leave it to the politically correct schools to do it all.
I remember when they were 3-4 going through the star, car, bar, tar etc english words. And when we were sitting outside the store while mom was shopping going through the whole farmer buys seed, grows crops, buys gas, brings to store, store sells, makes profit, pays employees who shop and spread money around etc. They got tired of me lecturing them every chance I got but they absorbed it so I didn't care if they got tired of it or not.
Through their high school years it was trivial pursuit cards at our dinner table. I read the questions on the cards and gave them a chance to answer then gave them a short lecture on each one. It forced them to use their gray matter and made their minds more flexible. We had a couple of decks and borrowed 2-3 more decks from relatives. They whined about that too. But intelligence is comprised of two components just like a computer. There's a structural component that we're born with and can't do much about, and there's a data component that we can DEFINITELY do something about.
This is high quality involved parenting. Thank you. There are to many people/ parents that don’t realize that parents MUST be involved if they want a good outcome.