Not something you can do before tomorrow, but something to think about for next time:
Get the SAT Study CD. I bought one of these several years ago when I was taking the SATs and it surprisingly helped my score. The SAT is nothing more than a test of the most basic of public school curriculum...6th grade math, simple English concepts, etc. The thing that tends to psych people out is that they make it out to be harder than it actually is. The CD I bought was a comprehensive review in the same format as the way in which the SATs are administered. If nothing else, it showed me that I needn't worry because the material was all stuff I had already learned long ago.