Make sure you review the math, grammar, reading, and essay wriitng tips in this blog, as well as in the review book you're using. DEFINITELY do a sample SAT test under timed conditions (that is, only allow yourself the time it says at the beginning of each section), including the essay. You want to practice doing the test under time pressure so you know what problems to focus on last, or skip altogether, on the real SAT.
You also want to accustom yourself to writing essays quickly, and to polish your format for your introduction and conclusion - e.g., "The author uses literary devices such as [name them], factual evidence such as [name them] and rhetorical devices such as [name them] to make an effective argument for [the author's main point]." Don't forget to mention ethos, pathos, and logos - see my other blog entries for details.
Don't forget your admission ticket, your calculator (bring spare batteries), several sharpened pencils, a watch, or a snack. Leave your cell phone at home. Make sure you know how to get to the test site using public transit or walking in case you can't get there by car that day, especially if the site is NOT where you attend school. See my earlier blog entries for details, and see the College Board site for details regarding admission tickets, acceptable calculators, identification, and the like. Good luck!
Author: John Linneball Who did you think? ;-)
I'm the proprietor and only tutor for this business; that's why I named it after me.