How can I practise questions I've previous got wrong or haven't yet seen?

Touch "Practise" on the main Theory Test app menu:

Touch to select the categories from which you want to see questions, or touch "All categories" then touch "Next".

Touch either "Previously answered incorrectly" or "Questions not yet seen":

If there are insufficient questions "Previously answered incorrectly" or "Questions not yet seen" to fill the practice session additional questions will also be included.

Touch "Start" to begin the practice session