Hi Lucy,
Having never taught accounting but having taken several accounting courses that I thought would go on forever (I wasn't a good accounting student if you haven't guessed that already) I would suggest trying to create some competition between the students would be helpful.
Is it possible to set up teams and have competitions in relation to solving problems or balancing general ledgers? The key is to even though the material may seem to be dry by creating a game of it you can get the student engaged. The games might be played every few days, for test reviews… >>>