Reversing your vehicle into a car parking bay is an every day manoeuvre which may be examined during your driving test. You should always reverse into a bay when possible so that you can drive forwards out of the bay on your exit, enjoying the best possible view. Think, small children can be very difficult to spot if you reverse out of a parking bay.
If you are required to perform a bay park reverse during you test it will be carried out in the test centre.
Remember if your not fully in the bay, pull forwards out of the bay and try to reverse in again.