<p>Okay so i've heard experimental section/variable section are questions that are used for testing so they may appear in future SATs. So shouldn't we practicing them so as they might appear in a future paper.</p>
<p>Some of these questions will appear in future SATs, others have already appeared in the equating sections on past SATs and may possibly not show up again or appear on a PSAT; it is not always easy to distinguish these two types. More importantly, a delay of a few years between the first appearance of a question and when it is actually used in a graded section is not unusual.</p>