If you do not have a teacher login, several educational document-sharing sites host parts of the answer key: Workbook & Unit Answers : Offers various documents like the Oxford Discover WB Key and specific unit keys such as Unit Test 6 Answer Key : Provides keys for broader assessments, such as the Od6 Final Test Answer Key Video Walkthroughs
While writing tasks are subjective, the key often provides model answers or rubrics that show what a high-quality response looks like. Where to Find the Answer Key Oxford Discover 6 Answer Key