My way to accelerate was to take enough AP courses so that I was able to get a BS and a Masters in 4 years of College.
I'm aware of the AP path, they had some of those classes in my high school. The quality of each program varies from school to school. But it doesn't really make as much sense as outright skipping 4 years of drudgery and getting on with the real work ahead.
One kid I knew took enough courses to supposedly qualify with sophomore standing when he graduated, assuming he passed all of the challenge tests. But if he had spent 4 years working at a college level he would have had much more than sophomore standing.
If you got a Masters & Bachelors & High School in 8 years, think of what you could have accomplished if you could have started college earlier.
For a typical advanced kid, those extra 3 years of schooling are difficult to swallow, and even just looking at starting salaries (with no raises), one would be $90k ahead of one's peers at a starting salary of $30k. If half of that $90k were put into savings, the kid might have over $300k in 30 years.
http://partners.financenter.com/choosetosave/calculate/us-eng/savings02.fcs
Amount you have invested $45000
Your savings rate % 4
Additional deposits $ 10,000
Yearly
Years invested 30
Your federal tax rate 25.00 %
Your state tax rate 6.80 %
Inflation rate 3.0%
In 30 years, your investment will be worth $330,376.
That's just looking at it from the financial side. The kid would certainly also bypass 4 years worth of liberal lunacy, which is worth more than $300k in my book.