D.s.Rawat is Best

PADUKA - By G.Sekar and B. Sarvana Prasath 

Reason :

Covered each and every prob from past exam + module 

Best Theory 

Fast Track Referencer for quick review 

Covered special Coverage of AS 30 ,31,32

Costiliest among all ( Around Rs.650/-) but Worthy for professionals too

Dr Sanjeev Singhal , Practice Manual and Past 6 RTPs