<p>How?? Are there some sort of giveaway hints on the paper or something?</p>
<p>I don't think you should be spending time trying to figure out which section is experimental. If you accidentally assume one of the sections is experimental when its not and that influences the way you answer the questions for it, then... yeah, not good. After the test, Collegeboard releases that info on their website.</p>
<p>Definitely don't worry about it, there are quite a few people who blew off what they thought the experimental was and ended up that not being it. So don't worry about it and take it like you would for any other section.</p>