Best book for ipcc cost fm

plzzz suggest  best book to  clear concepts of cost n fm among ravi m kishore ,pc tulsian ,rajesh makkar, alok agarwal and mirdu agarwal. i have paduka but it is only a compilation of past year exam ques it doesnot clear concepts. this is the only subject which is causing me problem in clearing ipcc. plzzzz help. the above written names are some of famous writers. if any other plzz suggest that also. i want to purchace in a day or two.