A smart person is someone who goes with life as it is, he knows when to take advantage of the things that surround him and he takes mostly decisions according to his convenience, he knows how to deal with people.
An intelligent person is someone who has skills to learn, to study, to memorize; mentally attitudes to work with knowledge.
A wise person is someone who knows what to do and when to do it, someone who distinguishes between one thing and another and realizes the importance each thing has on each place.