I failed the first time, like so many of us. This $300 was wasted and made Cisco and their test partners $300 richer. But I learned my lesson: Be ready, really ready, before the CCNA exam. So many topics are covered, you need to know everything and also practice every concept on packet tracer before.
So if you failed once, take a few weeks to re-acquire the information, do many many labs, create labs, troubleshoot labs, until you are comfortable, then take it, you will succeed!
Next up: CCNP switch.
Original thread:
http://www.techexams.net/forums/ccna-ccent/78680-failed-ccna.html#post646373