I had preparation time beforehand to write down everything I would say at the relevant points.
That is the most important! You are given quite a decent length of time (I can't remember now but it was around 15-20 mins). So plan your trip and write down verbatim (if you want) all your calls.
Remember the 5 Ps
Perfect Planning Prevents Pathetic Performance!
There is a version with 6 Ps but modesty prevents ....
Cheers
Whirls