It sounds like you are looking for a critical, well-structured essay on the FCE Practice Tests by Karen Dyer and Dave Harwood, with a specific focus on the audio component (listening paper).
Week 3–4: Skill consolidation
The practice tests in the book are accompanied by audio recordings, which provide students with an authentic listening experience. The audio components include recordings for the Listening and Speaking sections of the exam. Fce Practice Tests Karen Dyer Dave Harwood Audio