Know privileges & limitations. Not just for the CFI, but also for the various qualifications you'll be able to teach. Don't forget renewing the rating stuff.
Know the logbook sign-offs
Know VFR & VMC criteria
Know the various things to do with learning (straight from the FAA's instructor book)
Be able to give the various flight lessons, as well as teach aircraft systems, including complex items eg constant pitch prop, electrical, fuel, how the various flight instruments work.
Know the limitations & info for the aircraft you'll do the test in.
Make sure you have revised (& corrected) those knowledge areas from your two theory exams that you answered incorrectly.
Be very familiar with FAR 61. Ditto medicals and the like.
Last edited by Tinstaafl; 28th April 2013 at 18:48.