My daughter is much like your son (she is 4). She has to have toys played in certain ways, colors arranged in certain orders, otherwise she gets really upset. Also she won't sing songs, etc., until she feels she can do it absolutely right. She always recites children's songs and verses to herself in low voice before sleep in the darkness. Such kids can have good concentration and develop a good sense of fine arts.
Your child's personality to a great extend is inherited from you, and there isn't much you can do about it. It won't do much good to force him to change his ways, but you can spend certain amount of one-on-one time blocks with him to show that there are other ways of doing the same thing and have fun. When he has concentrated on something for some time, guide him to finish it (and reap some sense of satisfaction), then ask him whether he wants to do it again (but to reach a different conclusion from a different aspect) or move on to something else.
It is important that the school environment is friendly to him, both by the teachers and the classmates. You probably want to spend a couple of hours there observing and have better communications with the teachers.