It's more or less been said before, but I find CARPACER very easy to remember.
C allsign
A ircraft type
R oute
P osition
A ltitude
C onditions
E stimate
R equest
If you get the chance to sit in the back, with a student/instructor on a cross country flight, this would be a good exercise as you can concentrate on listening to what ATC are requesting and how you would respond.