No matter how much you test/quiz your students there are always those who miss or misunderstand a question or two or five or seven. You really want them to simply 'get it' and need a simply way to reinforce the answers. This is a simple structure for THEM to find the correct answer and 'put into THEIR brain' without you doing all the extra work. Now if they choose to not try to help their self them at least you made the effort.
I have used this form for years and in most cases it has worked. There have been a few who refused for after a while of them being the only ones who did not IMPROVE their grades, they came around to my way of getting the job done.
Run the 'update sheets' off front and back. If they need extra sheets I let them get them – which means they are trying to do better.