Before the A.P. Exam, everyone should review over the content on the 12 A.P. Labs. There is a virtual version for all the labs at Pearson's Labbench:
http://www.phschool.com/science/biology_place/labbench/
Try going through each lab and answering the quiz question. Or if you don't have much time, just try each quiz and go over the parts you get wrong.
There are also brief reviews of each lab available at this site:
http://www.ekcsk12.org/faculty/jbuckley/aplabreview/index.htm
