I notice on that one link they talk about a student who is involved in a "dual credit" program with her local community college.
For parents of older homeschoolers, if this kind of program is available in your area, I would strongly recommended it.
We decided to try it out a couple of years ago, and without pushing too hard, my son finishes up his last 3 hours needed for his AA this next term (he's 17 and would be a senior in high school this year, but has been in the dual credit program since 10th grade.)
The best thing about it is that in many states this type of program offers free tuition.
Here's a link to our local program. I know they have the same type of program in NC and I imagine in many other states.
http://www.spcollege.edu/ac/dc/
One really positive advantage is that while taking these "core courses" that many times exposes them to liberal thinking, they are at home, where you can discuss the courses and material with them and head off any misconceptions that are being pushed on them by liberal professors.
Dual enrollment is a big plus imo. Graduate HS and get a degree at the same time! Can't beat that!