Review is very important when teaching.
There are many methods that can be used.
Numbered Outlines. I like to use a numbered outline. For example: 1. God make light and dark. 2. God make sea and sky, etc. I have found that a numbered outline seems easier for the deaf to understand and remember. I use this for preaching also. I number the main points. As I preach, I continue to review each numbered point. (1. All sin 2. Hell 3. Jesus die 4. Believe Jesus saved.)
Fill in Blanks. You can use this for both written and signed reviews. For written reviews, just write your teaching on the board and leave one word blank. I often will write the first letter of the word to give a clue as to the right word. As for signed reviews, I tell the deaf I am old, and I forget things. Please help me remember. I then sign a verse or an outline. When I come to the word I want them to tell me, I stop and act like I cannot remember. The deaf then tell me the right word.
Games and Quizzes. Many games and quizzes can be used. We like to divide the class in two or three groups. (We divide by boy/girl or by dividing the room into 2 or 3 parts.) Then we ask questions and see who can answer the most questions. We then give out small prizes to the winning side.
Picture review. You can review by showing pictures from the lesson and say, who is this? What is this? What happened? You can also mix up the order of the story and see if they can put the pictures in the right order. (Example, mix up the creation story pictures to see if they can arrange the pictures by order of the creation day.) Review, review, review until they understand.