I spend time reviewing all concepts before I test my students so that students don't go into the assessment "cold." I review each concept that we have covered in the previous unit, but I do not "teach" the concept. A review is exactly that, time spent gliding over topics and bringing it freshly into their minds. It is not a time to reteach concepts.
My process is to teach, teach, teach, then review, then test, and, last,reteach. I have never had a topic that the entire class mastered the first time. I use the test to decide what concepts need further reteaching. The common core standards want our students to think about what their doing, not just follow a list of steps. You will want to test to see are they examining their thinking and processing the skills you are teaching them.
Your review should touch on:
To make sure all students get a chance to participate in this review, I will use a mixture of calling on volunteers for answers to questions, asking students to turn to a partner and talk to them about ideas about review concepts, and using sticks to cold call on students randomly to initiate whole group discussion.
When I pass out the Understanding Addition Test I will walk them through it by reading the instructions and pausing at each section and give them time to complete it. If I feel the only part they should get support on is reading the word problems (I don't want a student to miss a problem because of decoding issues), so I will have them go to that section first, read each problem to them and solve. Then, I will allow them to work through everything else on their own.
I learned early in my career, first graders get the wiggles if you do not give them something to do. Also, we all know kids never finish with the same test or assignment at the same time. It is easy during an assignment to allow the early finishers to turn it in and move on to a center, read, or some other type of independent work. When I have allowed freedom to roam I have had students wandering over to help others or begin conversations that disrupt others.
My answer to this issue is to always give them something to do at their desk that can be accessed quietly and not disturb their neighbor. I always make sure they have their library book or a classroom library book at their desk before a test. Also, I give instructions before the test if they finish early, please turn their test over and draw a picture. Watch this Test Management Strategy video. If you have been studying a certain topic, have them draw a picture related to it. You could even offer a bonus to create their own problem, fix a sentence, or draw a picture about a character in a book that was read that day.