Plz help me regarding how to prepare for Costing & SFM...though i took coaching from Sanjay Aggarwal sir..but i m not satisfied with his book...plz refer wat to do..is his buk sufficient for xams or i should go for another buk also...also tell me is it worth goin for SFM classes..if yes then tell me wich teacher in delhi...or i can go 4 self study of SFM...plz refer d buk also