Suggestion for books to be referred for CAFinals old course.

I am assuming you are asking books to be referred for self-study:

FR - M P Vijay Kumar 

Accounting Standards - D S Rawat or Ravi Kant Miriyala

SFM - S D Bala

Audit - Pankaj Garg

Law - Munish Bhandari (textbook)

Costing - Dani Khandelwal's class notes or ICAI study material

ISCA - ICAI study material

DT - Bhanwar Borana or Durgesh Singh

IDT - Yogendra Bangar

If you refer the above authors/books, you will need to refer PM in Audit, Costing, ISCA and DT. In case of the other subjects, a cursory glance at the PM should suffice. Good luck!