How is v.k agarwal sir's ca final audit book

best book for self study , you can choose any of between pankaj garg and vk aggarwal both are best .

for comparison you can see inside content here  https://www.lionkart.com/p/advanced-auditing-and-professional-ethics-by-vinod-kumar-agarwal/

no no. dont go for VK agarwal's audit book. its difficult to revise. and looks very bulky like DT. go for ICAI material only. For audit ICAI material is the best one.