If you have a trainee driving instructor licence, get as much practice teaching pupils as possible. Some driving schools will help trainee driving instructors gain practice and then give them a job as an ADI when they’ve passed the Part 3 test.
The instructional ability test lasts about 60 minutes. It’s divided into two ‘phases’ with 30 minutes for each phase.
In phase one the examiner will take the role of either a pupil who is a beginner or a learner driver with limited driving knowledge. In phase two the examiner will take the role of either a pupil who is near test standard or a full licence holder who needs driver improvement training.
Watch this DVSA video for a quick guide to what happens at the test.