Reference book

You may go for the following options regarding books for ca final:

For Accounts : M.P.Vijay kumar or Shukla & Agrawal along with Module And Compilation and for AS part go for D.S. Rawat

For Audit: Prakhar Sharma/Paduka/ V.K Agrawal
Note: (MP Vijay Kumar can be used for AS reference)

For Corp Law; Munish Bhandari

For Mafa: Module and Notes of Tarun Mahajan. You may also refer A.N Sridhar.

For Direct Taxes TN Manoharan (Theory part), Circular, Notification, Amendments, case law

For IDT: Vandana Bangur

For MICS: Module

For Costing: Saxena and vashist or Ravi M Kishore with module

Also refer Scanners and Suggested Answer issued by ICAI for previous year exams and revised them properly.

For Costing - You can refer Saxena and Vashishth. But For MAFA , I will suggest you to take question bank with solution od any teacher who takes MAFA classes like Ashish Kalra or Rajesh Makkar for practise. And theory part should be covered from ICAI Study material itself. I also have studied  self in the same way. For practise some question bank is necessary. But still if you want to go for some book, then Khan and Jain can be a good option for you.

costing-paduka

FM-bala n pattabhiram

Thanks everybody for ur valuable suggestion.