Innocent, your child is still young, and to add to that, he is a boy! Boys often find it more difficult to concentrate for longer periods. I am sure he will be fine. Let school worry about the reading and writing for now and you can help him with his concentration by doing things like puzzles and playing games with him. Play I-Spy when out and about, get him to make up stories and tell them to you, you read to him and then talk about what you have read for e.g. ask him why he thinks the characters were feeling that way, what he thinks will happen next? Sometimes as well the way in which we as parents try and teach our children about reading and writing is different to how the school teaches it. His teachers will help you to not confuse him and will give you both lots of homework I am sure. The most important thing is that he has a mom like you who cares.