K1 is just the start, don't worry too much. Boy is usu. slower, as long as he could understand what other's saying, it's ok.
It's true that 會蝕d, 特別係競爭大既學校. One suggestion is that since he is already 2, you could just help to enrol some kindergarten near your home (just anyone, may be Canan, they would take kids with just 2) to study the nursery now, it would be very effective for him to learn with other kids in these few months.