We describe a method that instructors can use to grade tests and assignments that can be used in follow-up inquiry-based activities in class to review material. The grading process is essentially a sorting of student assignment/test responses based on the instructor's conception of what makes responses acceptable. The instructor can assign a grade to each category and then provide a representative response from each category for students to discuss in peer-to-peer interactive group activities. We describe the grading process through an example from a first-year "introduction to proof" course and provide evidence that the students find these activities to be worthwhile.