Following is the summary of all answers below:-
Accounts: P.C.TULSIAN is the best book for accounts. This book is very detailed and everything is clearly explained. D.S.Rawat for accounting standards.
Law: Munish bhandari for B.LAW and C.Law.
Costing:- Purushottam Sir for Costing
Taxation: V.K.Singhania is really good.But you may refer either padhukas or T.N.Manoharan book for indirect taxes. T.N.Manoharan and Padhukas books are also suggested by a lot of people.
Advanced accounting: P.C.Tulsian and D.S.Rawat for accounting standards
Auditing:- Both padhukas and surbhi Bansal books are good. Go through both these books and buy the one you find more interesting.
Financial Magagement:- P.C.Tulsian Book IT &SM - IT-ICAI study material and practice manual.
Don't ignore ICAI books.
Good Luck.