I am taking the ASVAB on Tuesday. Where can I find some online study guides for this military entrance exam?

I just visited my Air Force recruiter on Thursday, and filled out about sixteen pages worth of paperwork.

He has scheduled me to take the ASVAB on Tuesday Morning, and I have to show up at our Mall’s recruitment center at 8:30.

Now, to help me prepare for the ASVAB, what are some online resources that would serve as study guides for this fabled test?