Pray a lot. ;-)
You will be asked to give the five enharmonic
spellings of various o7 chords.
Be able to provide the popular chord symbol for each
of the resultant chords when one factor of the o7 chord
is lowered one half step.
Be able to create a modulation between two given
keys utilizing our friend, the o7 chord.
There will be a few examples for which you will be
asked to provide a Roman numeral analysis. (No Latvian numeral
analyses on this particular test.) Of course, these
examples will be the most difficult I can find in terms of
stupefying enharmonic spellings. ;-)