Ama book

Saxena & Vashist or P C Tulsian or Dr J B Gupta any of this.

S & V is a detailed Book to give you Good Knowledge of Every Concept in Depth & theBest Book

P C T & Dr J B G both are Equally Good & also Conceptual but more towards Exam Oriented. Now Its Your Choice which Suits you the Best

All three are Good as they are explaining Concepts of every Topic, However Since you have time / If you have reasonable Time that can be allotted to this subject then you can go for S & V, your Concepts will become clear beyond doubts & your Panic for this subject will disappear. You will learn the proper way to approach & begin the solution of question of any topic Drafted & set in any way putting any category of tricks in the Question

Suggest you to first go through Text and practice material of the Institute.  In case, you find it difficult or stuck up at some place, then you refer any book suggested above for clarity in that topic.  I feel this is the best course to cover the subject well in short time.

Thanks!