A: Yes, most editions include a unit test or an IPA. The answer key is included in the Teacher’s Guide. It will show the expected answers for the interpretive reading section. For the interpersonal speaking and presentational writing sections, you will find a rubric—not a rigid key.
To help you prepare for a specific part of the unit, let me know: Are you working on the questions? Somos 1 Unit 8 The Comprehensible Classroom Answer Key