Source: The Great Interpretation of Dreams (Ibn Sirin)
Cheating in an exam in a dream indicates cunning, deceit, and not being prepared for matters.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Cheating indicates committing a sin or following a false path.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Cheating is interpreted as worry. Whoever sees himself cheating will be afflicted with worry.