Your preparation is of the up most importance, so you must make sure you are physically and mentally prepared! It is know good thinking you know best! You must be prepared for the best option. Because you can not control anyone around you you must control yourself! You will be out on route for about 35 to 40 minuets and have to do a manoeuvre, ten minuets of independent driving and a possible control stop.
Your driving examiners are there just to observe, they are not there to trick you! Some examiners may wish to assess you in silence, others may talk to you and try to make you feel comfortable. After all they are not on commission to fail you!