<p>Well JBVirtuoso, it helps if you know the test center and the weather, but even then I always prepare for the worst in layers.</p>
<p>First, I wear a T-shirt, then a long sleeve over it. I'll usually bring a sweatshirt if it's not June-August. October-April usually merits some sort of lightweight fleece, and November-Feburary, a full on jacket.</p>
<p>You may make fun of me, but I had to go to an SAT (John's Hopkins, old style) and the room was 50 degrees (you could see your own breath).</p>
<p>Usually, I wear long socks during non summer tests (I roll them down if it's warm), and I always take something cold to drink. If possible, I take a convertible pair of shorts/pants during the fall/spring, and I always wear pants during the winter.</p>
<p>Yes, I'm obsessive, but I'm always comfortable in the testing room :D</p>
<p>Even if I'm at the same test center, I plan as if the room is cooled/heated differently or (more likely), I'm in a different room. My test centers are always crowded.</p>
<p>I'd try to sit as far away as possible from other people in a non crowded test center- if you get a jerk for a proctor, he's less likely to kick you out when you sneeze or go to pick up the pencil you dropped. If you get a lenient proctor, you're still far away from distractions (and temptation).</p>
<p>In short, JB, I always overdress because you can remove clothing if you're too warm, but you can't add clothing you didn't bring, and if you sit away from other people, it'll make you more comfortable (you won't hear their nervous tics as much) and the proctor too.</p>