You have told a lot of untruths in this thread trying to make your point. Though many have been pointed out, your claim that the Palin kids did not go to college is apparently a lie too.
Seems Track, the one you claimed was a high school dropout, which was a blatant lie, was enrolled in college before he married his high school sweetheart, had a kid and worked as a commercial fisherman. A year later the couple divorced. TMZ covered the whole ordeal and stated "Track is an Army reservist and served time in Iraq. He's a commercial fisherman and plans to go back to college."
Sarah Palin's Son Track Headed for Divorce Court | TMZ.com
You can't "go back" to something that you have never done before.
Not everyone earns even a bachelors in 4 years. Sometimes the choices we make in life keeps that from happening especially those who take responsibility for their choices. They usually put their personal goals on hold or take longer to reach them to fulfill those responsibilities.
You have no way of knowing if Palin's two oldest children are enrolled in college at this time because colleges/universities do not divulge that information. Major universities offer online degrees. Certainly kids that are hounded by the press and already working and living a busy life, online classes would be a real option.
U.S. News Releases 2014 Best Online Programs Rankings - US News