Prepare for a retake
Use what you remember from the last attempt to decide what to practise next. You can start with the topics that slowed you down and work back towards the full test.
List the topics you want to revisit
Write down a few subjects that felt unfamiliar. Review their lessons and practise questions before moving on.
Practise at the pace of the test
Try a timed mock once you have reviewed those topics. Use its result to plan another session.
Check the current official guidance
Confirm the booking details and test rules with the relevant authority before the date of your retake.