Don't take the whole period. The key is minimum time - maximum effect. Then correct and discuss the items. If there are several possible answers indicate which are better and why. If there are essays, ask students for the essential points, then evaluate their responses.
Some teachers question the value and purposes of review sessions.
But like any other class session the teacher must prepare. Then structure the review session according to your purposes. Back to Evaluation of Students The Center for Teaching, Manhattan College, Riverdale, NY Br.