Another thing we do to help improve is WOW tests. I set the timer for 3 minutes and he writes down all the words he knows how to spell to beat the clock. After a couple times I take it down to 2 minutes and then to 1 minute. He even requests playing this game from time to time he likes trying to beat his old score. It's always fun to do when we haven't played for some time because I'm always amazed at the different words he has learned how to spell.
Take Care :)
