Simply having the child correct the problems they get wrong (or didn’t get to do), plus two extras from that page is often enough of a consequence to motivate a child to work quickly without rushing and making simple mistakes.Teens love their technology, their friends, and their independence, so they make prime candidates for consequences.
They might benefit from more direct supervision in their lessons or frequent check-ins.
It could be they need a hand setting up a schedule or an outline.
Once they get help in the area they are struggling with, they usually do well with it on their own, but you may experience a few lapses over the teen years when you need to swoop in and assist again.
Have your teens start the homeschool day with their toughest subjects under your supervision (or at least nearby ) before moving on independently with the easier subjects.
Getting the hard things out of the way usually will encourage teenagers to fly through the rest.