This practice covers the same skills as your exam, in multiple-choice form so you get instant feedback. On the real exam you will write out full solutions on paper, so work each problem completely before choosing an answer. Use "I don't know" honestly instead of guessing: it helps you and your instructor see where to focus. The mix of topics and difficulty matches the real exam.
Conditions. The real midterm is closed-book and unproctored (taken on your honor). Practice these the same way.