Avoid expensive errors when paying for college

It’s just about Back-to-School time again. If you have young children, you might be hustling them to the store for backpacks and binders. But if you fast-forward a few years, you can envision driving your kids a little farther — to their college dorms. And when that day comes, you’ll want to be financially prepared. So you’ll want to avoid making costly mistakes when preparing for, and paying, those big bills. Here are some of the most common of these errors:

• Not saving enough — Only half of all families with children under 18 save any money for college, according to a recent...