A good way to prepare for your exam is to record yourself playing your exam program and award marks on listening back to your recording.
Music (Performing Exam)
The total program length for both instruments should be between 18-20 minutes
While you do not need to perform for an equal length of time on both of your instruments or on your instrument and voice, the minimum performance time for any instrument or voice must be at least six minutes within the overall 18-minute programme.