When I tutored the ABC's we ended eachclass by playing a gmae for review. By this time thier attentions apans were used up so it was a good way to keep them focused for the rest of class. Some ideas:
Pick any boared game or kid's game: Go around the circle, ask each child a random review question. If they get it right they get to take a turn at the game. Depending on the game, you can split them up into teams. Games that work well: Jenga (individual, not teams), Jumping Monkeys, Pick up Sticks, Cat in the Hat, Battle Ship for older kids, etc, etc.
Play a version of Doggy, Doggy Where's your Bone: One kid goes outside the door, another child hides the eraser (or whatever you have). Child #1 comes in and has to find what was hidden. The rest of the class sings or says a review sentence while he's looking. The class (who knows where it's hidden) sings louder if the child is close to the hidden object and quieter if the child is far away from the hidden object. This works great for timelne, history songs, bible, science songs, math songs, etc. This is my kid's all time favorite game! You may have to put a time limit on how long they have to hide it though, they really get into it!
Draw pictures for the sentences (especially history) to teach them sentence, then cut it up and let the kids put it together as a puzzle.
Stick Memory Cards to the bottom of the kids chairs before class. At the end of class split them into teams and let them pull them off one at a time and answer the questions. They can get a point for each one they answer correctly.
Hope this helps!
Mom of 8 ages 12 - 1 (and one more blessing on the way!)