Omg so much of criticism......Am studying costing from sanjay sir's dvd at present....its just awsome....am able to understand concepts clearly....and costing is more about practice once u get hold of basic funda guys.....the classes may not cover 100% questions of the book but it covers all the basic fundas related to that chapter and after finishing a particular chapter from that dvd i solve practice manual to see how much i grasped ..... and trust me one day before exam we will only be able to revise concepts ....but yes seeing dvd's at home needs lot discipline and regularity guyss...!!!!!...all the best