The examiner may ask you to park in a bay by driving in forwards and reversing out, or by reversing in and driving out. Unless the examiner specifies, you can choose whichever you are more comfortable with.
For reverse bay parking, drive slowly past the bay and stop about a car's width away. Select reverse, check all around, then look over your left shoulder as you begin to move. When the first bay line appears in your left mirror, steer smoothly toward it. Keep glancing at both sides to judge your swing. Straighten the wheel once the car is square in the bay. Stop before you reach the end wall or kerb.
For forward bay parking, drive past the bay and position roughly a car's width away. Check your surroundings, signal if pedestrians or drivers are nearby, and steer in at a shallow angle. As your front wheels cross the line, straighten up and drive fully into the bay. If asked to reverse out afterwards, check all around before moving.
Observation is where most faults occur. Before you start, scan a full 360 degrees. While manoeuvring, keep your head moving: left, right, and behind. If anyone approaches, stop and let them pass.