Take a practice test online to get ready for the Big One - both websites offer great practice tests that are taken from the main bank of tests that are actually given.

http://www.eham.net/exams/ - you get results after you have completed the test
http://www.qrz.com/testing.html - you get results as you answer each question

Volunteer Examiners Question Pool
http://www.ncvec.org/