Remember, after Aug. 1st 2007, CCNA 640-801 will no longer be valid but still good for the next 3yrs then it's 640-801 CCNA.
Good tip is write everything down before you start the test. Like Subnetting, binary set up, Class A, B, and C, perhaps D to be well prepared, you know those things will get you right up your alley. Whatever you can think of, write it down, you have that right to do that before a test starts. Be patients and not spend too much time for each questions, or you'll find yourself started to rush at the end. It happened to me.
Good luck...
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R. Corrigan Jr.
Network+, (working on CCENT+CCNA)