Study plan for auditing and assurance

hello .....can anyone plzz guide me about auditing and assurance...for ipcc group - 2 i have cleared my group -1 and will be giving group -2 in nov 15 attempt.... which books will i have to refer for auditing and assurance....i am presently doing it from the practice manual only....is it sufficient????....or should i use some other book....for auditing ....?????...... plzz help