A very important part of successfully passing the driving test is smooth driving. This means driving without jumps and braking early and gradually. When you drive smoothly it shows good planning and demonstrates to the tester that you are confident and in control of your vehicle.
In relation to the accelerator you should only ever give gentle revs, there should never be a need for heavy acceleration unless you are taking off or climbing on a steep hill. A good driver should lightly apply pressure on the gas when moving away and not let the engine get to loud when going up the gears. You should get up the gears as soon as possible as this will be less noisy and more fuel efficient.
The brake should be used in a calm and gentle manner. Planning ahead is key here. Try and analyse the situation you see up ahead. For example, if you are following a cyclist and you seem to be approaching a bend, then don't rush to overtake the cyclist before the bend, it's usually best to wait and have a clearer view ahead before you engage in a risky overtaking strategy. If you misread the situation and meet an oncoming truck, you could have to brake and/or swerve. Also you should try avoid going straight from the accelerator to the brake as this could be too sudden. Instead you should ease off the acceleration and not press any pedals for a second or two and then gradually press the brake. Planning ahead and keeping well back from the vehicle in front will help.
The clutch shouldn't be lifted too quick as it can cause the car to jump and feel uneven. A nice slow lift of the clutch is more smoother. You should brake first before going down the gears as this helps avoid jumps. It's important to get the speed reduced and then go to the proper gear. The same applies to taking off, don't lift the clutch quick as it could cause jumps or even cause you to stall the car. At the same time coasting should be avoided. This is keeping the clutch pressed in for a long period of time and is dangerous, especially downhill as it can cause the car to speed up.
So try and give the tester a smooth journey by being gentle with the revs and brake and slowly lifting the clutch! It has the added benefit of being more fuel efficient.