Thank you all for your support and advise. Here is a little more of inf.
The Pediatrician ask my son about school, he answered that he was bored at school. He just want to play. The Pediatrician said he need to be challenge and understand that school is something serious. He heed to learn to work harder. If it is too easy now that he is young then he will be an underachiever and will think school is a joke.
The school indicate that he will be the youngest of the 2nd graders and almost 2 years younger than the 3rd graders. Their experience is that boys are not mature enough to be working and sitting quietly without a recess for 4 or 5 hrs. That the older kids will see him as "odd" and will tease him. Also, he will not be able to finish the schoolwork on time, (he does not like to write - fine motors)
Thanks,