Some tips from my teacher I'd like to share:
If asked to contrast/compare sections or extracts, mention both in your answer, i.e. don't just say "extract b is loud" say "extract b is louder than extract a"
Be v. specific and name things precisely e.g. instruments- say "clarinets" rather than "woodwind" (if it IS clarinets )
Use Italian words to describe tempo e.g. Allegro, Andante, Adagio
Use technical terms wherever you can for immediate marks- but only if you're sure what they mean!
Melody: scalic/arpeggic/conjunct (stepwise)/angular (esp. in serialism)
phrase length and shape
Rhythm: syncopation/cross-rhythms (african drumming)/triplets/swung rhythm
Know the background info (e.g. history, names of instruments, etc.) for:
ALWAYS BE VERY PRECISE
and aim to have got your answers down before the final playing of each extract so that you can check them- an hour and a half isn't so long!
Good luck everyone!