My Cisco CCNA exam is now booked at the end of the month. Currently brushing up on various subjects and labbing as much as I can. Topics I'm still getting my head around:
1) Frame Relay (remembering the commands)
2) IPv6, remembering the various different types of addressing
One of the difficulty I find with preparing for the exam is that there is so much information, by the time I start a new topic I'm forgetting some of the things I've previously learned (as if they're being dumped into null0!). I think this is why labbing is the key to remembering as well as reviewing one's notes.