To keep your money, you need to give enough notice to the DSA that you want to cancel you driving test.
Lots of candidates cancel and change their driving tests, for all sorts of reasons. In order to keep your money, you MUST make sure that you cancel the test:
You will lose your fee if you cancel after this time limit, the only exception is if the DSA has to cancel the test e.g. for bad weather.
Booking the driving test isn't hard, however, it's a good idea to have the correct documents at hand.
The same information is required whether booking online, over the phone or by post