It seems to be not possible, I am the cashier, a few days ago, a friend of mine also said with the head of the class quit, the head of the class said you have to think about it, if you regret can not come back.

If a shopper quits, you can transfer to a clerk. If it is a class member quit, three months this can not rejoin the job, is to enter the job can not do the original work.