Told you so
News that thousands of children start secondary school every year without the reading , writing or maths skills they need is not mind-boggling to me.
Before a child can understand and carry out numeracy they need to spend a heap of time manipulating equipment and talking about it.
Before a child can read or write they need to have oracy. Before they can have oracy they need to have lots of experiences provided by home and if not home by schools, to enable them to develop oracy skills, and from that to begin to develop writing and reading skills.
It is not mind blowing. It is basic Piaget.