Since "CAE" can mean two very different things, here are two possible story interpretations:
It sounds like you're looking for a (narrative) involving a CAE (likely Computer-Aided Engineering or Cambridge English Advanced exam) and a PDF book . cae pdf book
— like a novel titled CAE PDF Book (unlikely) — could you clarify? I'm happy to write you a longer custom story based on CAE as an acronym of your choice. Since "CAE" can mean two very different things,
