In this exercise, students are asked to be the teacher and grade this test that was taken by a "student". Some questions are correct, and some are not. Some mistakes are computational, while others are skill mistakes. It is the job of the student to go through the test to find and correct the mistakes and deduct points where they think they should be deducted. If you have them work in groups, this provides great review for a real test, and it requires the students to justify their logic. Since there is no "right" or "wrong" grade, it also allows for a large amount of accountable talk as the groups have to decide how to award/deduct points for each mistake. The skills covered are reducing radicals, complex conjugates, operations with complex numbers, solving quadratics by factoring, solving quadratics by completing the square, solving quadratics by square roots, and solving quadratics by the quadratic formula.