<p>What’s wrong with sending all three? I’ve read that in some schools they consider your best score in each section. Although some consider three attempts as “too many,” I see nothing wrong with trying to improve your score, and I doubt colleges do.</p>
<p>I think it costs for each ACT sent (unlike the SAT). I don’t think it matters much. Depending on what you want to study (humanities, math or science), you could pick the one that puts you in the best light.</p>
<p>I’d send the first and second set. You have a sizable difference in the scores, and someone may take notice. (I’ve never seen such a gap in science scores.) If they super-score, even unofficially, you’ll look much better than a 29 composite. You might even make this point in your essay, if you can tie it in without making it sound like a excuse.</p>
<p>Don’t send the third set because it tends to confirm that some of the high scores were a fluke.</p>