I will be playing Messiaen's Transports de joie at RAM's audition for postgraduate entry. To be honest, I am pretty worried about it, it does sounds very tricky to me. Could fellow organists offer me some advice will be great.

When is the audition? Good luck with the preparation. I am sure you will be fine as you have learned so much advanced repertoire within a short period of time.

Make sure that you have really good fingering and think in subdivisions. Focus on a few bars at a time, learn LH with pedal and RH with pedal before you put everything together. This shouldn't be too bad if you can play Demessieux's Te Deum.