Willa:
congrats on the good news. I hope that Mite is excited about the skip!

My only thought is to ask whether there are any 4th grade curriculum based assessments that you can have a copy of, for any subject. That way you can skim through for content that he would have covered to make sure he is missing anything that WON'T be repeated in 5th grade. We are doing that with math, referring back to the 2nd grade Saxon assessments to make sure we cover what our school expects, since we are using a different curriculum for the home math. We are covering much more than the school curriculum, but this way we don't leave out specific concepts he will need next year.