Plzzz suggest best book.......

hello.....

Plz can anyone help me out by suggesting the best book for Advanced Management Accounting for CA FINAL 

Which helps to clear all concepts and also help me to clear the exam (MAY 2012) as the trend in current exams has shifted from long and straight forward questions towards the short and concept based questions..

The book in which both COSTING AND O.R are clearly and conceptly gud..

Thnx & Regards