I hear a lot of people say they only used the Encyclopedia or only used Dr. R’s CDs to pass their exam, but Dr. Rosenthal recommends both. Is that correct?

Yes, this is likely the most important exam you will ever take and thus Dr. Rosenthal recommends you arm yourself to the teeth with knowledge. His advice is always to use the Valedictorian Mastery Tool Kit. At the very least, use the Encyclopedia and the audio CDs.