I already use review as a key learning tool for my students whenever I have the chance, however, a pre-test is something I should certainly take into consideration. It's a great tool not only for the students to set their expectations as to what the class might entail, but for the instructor to make sense of the student's progress!
Reviewing material is very important, but I think it's important for the instructor to avoid reviewing material directly from a test for quiz. I've seen a lot of instructors use their test as the review material. You want to make sure students are understanding the concepts and not just memorizing the questions for short-term regurgitation.
Reviewing material is very important as it can be a key learning tool for students and for teachers to gauge short coming in learning. To possibly consider review of one's lesson plans and associated concepts for comprehension.
Students must be shown why and how information is relevant and applicable to their future careers. Otherwise, their brains will filter out information it doesn't deem useful enough so it can make room for more useful knowledge.
Frequent reviews are crucial. You can vary the applications and methods of review for more thorough integration of material.
Comment on Helen Saunders's post: I agree this is the best way to determine if the information that is being presented is being absorbed by the students. If the information is not retained you can formulate another plan.