I wanted to interject here with a link to a helpful guide for preparing for the Ph.D orals examination, entitled "An Orals Survival Kit:"
Too often, no one explains to graduate students what to expect of their comprehensive exams.
It is like standing in front of a firing squad. Your executioners are four professors who are experts in their fields. You writhe before them as they take turns posing questions almost beyond your grasp. The threat hangs constantly over your head: Fail to satisfy them, and your graduate career will end.
Parts 6-10 will be up soon.