"What does the young adult *want* to do?"
Does this child *want* to be home-educated ... or does he just want to sleep & play computer games?!Where does *this* kid want to go?
What are his strengths/weaknesses? (eg invest $ into strengths and perhaps less into other programmes if they are not key learning areas)
If he doesn't know, then find out what he wouldn't like to do.
How about joining with the local woodworkers guild.
Know an artist in your area who would be willing to sit with your son/daughter each week either or at your house or theirs?
Is there a community group that does pottery? portraits? landscapes?
What about a job working with a lawnmower repair place? Or a bicycle shop?
If s/he knows how to fix bicycles already he can set up a shop at your place. Most bicycle places don't do puncture repairs anymore, they just change the tube.
How about orienteering?
Tennis? Squash? Swimming?
Are there groups in the area that s/he can join.
Motivation and Compliance
The young adult needs to see "the point". eg everybody does Maths & English, as "compulsory subjects", because they're the foundation - but maybe one child wants to study accounting & another chemistry, because of – their own - future plans.
No radio or tv on when doing school work, need disciplined studies at this age.
Use a student diary and let them plan their own work
Hold them accountable to showing you what they have done or need marked each day - don't let it mount up.
How long do yours spend 'doing school'?
The older they are the more they do. They understand that more work (either schoolwork or housework) is a sign of growing up.
Expect 5 "subjects" (not necessarily all every day), plus housework & family discussion time.
Morning and an hour or two in the afternoon for a young adult.
Have they jobs outside of their formal education?
Let them do a paper runs, or an "after school" job eg supermarket.
Give them a cv/ reference
'Pimp' your children ie get them to work for free
Can they get work experience in an area they may be considering to study at tertiary level - finding out now if they really like a job is better than a few years down the track and thousands in course fees.
What age do you finish 'school'?
Let your goal be more "an adequate level of education" rather than finishing at a particular age. Eg all high school sciences, Calculus, general History/Geography, plus a decent amount of English.
Go for as long as possible to the degree needed for their chosen study or career path.
Is there any other advice on the high school years that would be helpful for our parents?
Give the teenagers some space & choices.
Get your husband to spend one on one time with your teen.
Get careers books out of library – useful to review and let young adults look through.
Give teens lots of down time, there's still plenty of time to be a grown up.