Costing operation research linear programming material.

                hi friends,can anyone help me out in linear programming graphical and simplex method.As in the institute module,i could not understand the steps and method clearly,someone having good notes or material of LPP(especially simplex method),please help me out in this topic as i am doing AMA on my own. I also want to ask whether study material and practice manual is enough for final exams or is there anyother material to be considered? please reply soon.thanks