P.S.
In Bibb county(Georgia) students have through pre-k and kindergarten to learn how to write their letters. If they haven't mastered it by the 1st grade, they will be placed in a classroom where there is a second teacher who can help them(I know this because I am a retired teacher). I'm sure that he will be able to write all the words by the time he finishes kindergarten. Work on his letters some during the summer. Good luck
P. S