At some point on your test the examiner will want to know that you can control your car in reverse. Beside the 3 parking maneuvers you can be asked to pull over on the right and to reverse back 2 car lengths before driving on again. This is normally seen as the easiest of the 4 maneuvers.
You will only be asked to do one of the four maneuvers. The examiner will generally find a quiet road to do this. Observations and acting on what you see is particularly important with this one. Remember to drive off safely as you are crossing a lane of traffic. Also because you are on the other side of the road the observations are now all on the other side.