As far as I'm concerned, SARAVANA PRASAD of Shri GURRUKRIPA LEARNING CENTER, Chennai is the master for Costing and FM for both CA PCC and Final. He teaches the subject so casualy and you will be infused into the subject.. HE teaches in exam point of view.. Another main fact is that He was the Ist rank holder in CA Final. With 76 % in aggregate and 99 and 98 % in a/cing and costing.. ALL THE BEST..