I can't say enough about how helpful AH0A's site is:
HA Info
Run through the drills enough, and you will walk into your exam with full confidence. The only thing more fun than passing your exam is slam-dunking your exam.
On a related topic, here's an exam question that I'd like to see added to the pool:
An amateur radio operator is most likely to overload a human brain when
A. calculating resonant frequencies of RLC circuits.
B. understanding velocity factor of transmission lines.
C. determining deviation ratios of a 2-kHz modulating frequency of 3.0.
D. reading and understanding the manual for a new transceiver.
Obviously, the answer is D.