My favorite "back to school" review is to get a whole bunch of plain yellow pencils (unsharpened), enough for every kid in Primary.  You'd want to do two seperate bunches if you have separate Junior and Senior.

 

Write the names to the songs you want to review on teeny pieces of paper, the width of one of the "sides" of the pencils, then tape them on to the bottom section of the pencil.  Put the pencils in a pencil holder of some sort and let every kid pick a pencil.  I usually go row by row.  If they don't have a song on their pencil, great, they still get to keep the pencil. If they do have a song we stop there and sing it.

 

Every year I have done this the kids have loved it because every kid gets a chance to pick, and gets to take something home.