DS has one year left at 'junior' school - ie next year he is in High School. He's muddling along getting 80% in his English and Maths - and the work he's doing is the same as he was doing (with me) 3 years ago. He is in a school - an expensive private school in Liverpool - that is supposed to stretch the kids and he is BORED! There is little help to advance these kids, or encourage them to move forward. It's the same in the state sector.
We need to get away from the misguided notion that schools are there to educate and teach our children; it is patently obvious to most of us on this site that they don't and they're not. What they are for...well I'll leave that to you to figure out. If you want your kids to progress and be stretched then the sausage machine - whether an expensive private part or a state part of the machine - ain't going to do it.