u can refer to kamal gupta for auditing if u intend to study the subject indepth or else u can go in for saravana prasath for conciseness.
As far as Law is concerned G.K. KAPOOR is the best
i think munish bhandari is the best book for law and for audit padhuka i good. but in padhuka you must see how much u should study and how much not. since it contains much more than reqd.