Or as close as humanly possible, even if it's 15 pages and they've given you 12 hours.  Don't worry about getting every word right.  Just know what story you're telling well enough to tell it without looking at the page. 

Go through your scene or monologue and mark out the events of the story.  First Ted comes into the room and sees Eddie kicking his cat.  Then Ted throttles Eddie for kicking his cat.  Then he immediately regrets his violent actions and apologizes.  Whatever the story is, know it well enough to be master of the events at hand.

Definitely grab a blazer if you're playing a lawyer, or a sweater if you gotta look sweet.  But pick something you've worn before, that you feel comfortable in - especially when it comes to what's on your feet.  Clothes that feel like You will let you do your best work! 

Or more, especially if you live in New York and have to ride the MTA.  I totally know the feeling of not wanting to soak up the pre-audition jitters of a waiting room - but being in the area is waaaay better than racing in last minute all sweaty and anxious and feeling like you now have to make up for being That Person.