Here’s a helpful, balanced review of the New Headway Intermediate Test Answer Key (5th edition, though applicable to similar editions), written from a teacher’s perspective.

3. The Workbook Answer Key (Sometimes Confused with Tests)

Many students mistakenly search for the "test answer key" when they actually need the Workbook answer key. The Workbook key is often found at the back of the Workbook itself or as a separate downloadable PDF on the Oxford website.