Source: The Great Interpretation of Dreams (Ibn Sirin)
(By analogy with a book and success) A graduation certificate in a dream indicates completing a matter successfully and achieving one's goal. It is good tidings of goodness and exaltation.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
(By analogy) A graduation certificate indicates a position, rank, or beneficial knowledge.
Source: Signs in the Science of Expressions (Ibn Shaheen)
(By analogy) A graduation certificate is interpreted as goodness and joy. Whoever sees himself receiving one will attain goodness.