Thanks for giving suggestion! I have also read the Electric Circuits-Schaums Series, A Companion-N.N lnamdar, Network Analysis-Soni and Gupta, Engineering Circuit Analysis.

Hi aspirant,
There is no such criteria that a particular book is best for preparation. Though the thing you need to do is to prepare for each and every aspect of syllabus that is mentioned for exam. Solving the previous question papers for the same exam and practising sample papers will give you the idea regarding type of questions that come or may come in the exam. Though you can have a look at these books if you want to-
-Solutions of Network Analysis-GK Publications
-Network Analysis-Van Valken Burg
-Circuit Theory-Chakravarthy
-Electric Circuits-Schaums Series
-Electronic Devices Circuits-Boylested and Neshelsky
-A Companion-N.N lnamdar
-Network Analysis-Soni and Gupta
-Engineering Circuit Analysis-Hayt and Kemmerly
-Graph TheoryNarsing Deo (Cutset and Others)
-Circuit Theory-Roy Choudary (Networks and Systems)
Hope this helps.