I had mine this past weekend (see Checkride Central for details). I'd say don't sweat it - know the Oral Exam guide but also know that you have all of your resources right there in front of you if you don't know something. Be sure to have the POH, FAR/AIM, Airplane Flying Handbook, etc. available and bookmarked with those sticky flags in case you need them. Also - be sure to get the scoop from others who have been examined by your DE recently!
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I really like the oral prep books by June Bonesteel that NO ONE seems to have heard of.
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I have all the Bonesteel books, expect for my instrument one that a student "borrowed" and never returned. However, I think they are overkill for a private student. Study from the ASA Oral Exam guide and the PTS.