When I review for a spelling test I put the class in groups of four. I mix all levels together and give each group member a number (one to four). I have Popsicle sticks in a can with those four numbers and draw one after having pronounced one of our spelling words. The students who have that number come to the board and write the word. The winner is the first one who correctly spells the word legibly on the board. I then give that team a point. This makes sure they help each other know the word because they don't know who is going to be called on next. The winning team gets a treat.