Class, Wit, and ability.
Well, let's take them separately:<br />
Educated means that you've attended some classes (or at least you've PAID for some classes) and answered enough of the test questions correctly. Education does NOT imply that a person is intelligent or qualified to perform a given career task.<br />
Smart is something one can become. It is more a categoric term for someone of whom possess natural intelligence, who may have used natural, intellectual ability to their advantage. This is known as being 'smart'.<br />
It is just a difference in that some may harvest their natural, often high intelligence, to become 'smart'.
A smart person knows what to do with what they've learned. An educated person who isn't smart just regurgitates what they remember but doesn't know how to do chit