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 .
Most CAE PDF books require audio for the Listening paper. If your PDF does not come with a CD link, go to the publisher's website. Most major publishers (Cambridge, Macmillan) have a "Resources" page where you can download the MP3 files for free using the ISBN number found in the PDF. cae pdf book
You do not have to break the bank:
Since "CAE" can mean two very different things, here are two possible story interpretations: It sounds like you're looking for a (narrative)
Theme: A hidden PDF manual changes everything. cae pdf book
Cae Writing Guide | PDF | English Language | Essays - Scribd