Confusion regarding learning SAP after Engineering?

I completed my Engineering graduation in Comp. Sc. recently. I have been selected by TCS and awaiting their call which will take some months. I wish to learn SAP in order to give myself an upper hand among my peers when I join. I have no fundamental knowledge of SAP other than that its knowledge will help me grow within the company. Please suggest me where I can get any online training programs or even offline classrooms to learn SAP. I would currently prefer online training.