Which book for idtl

And which one book  is best-Rajkumar,Bangar or Deepak Gupta... confused??

RAJKUMAR....

i have taken classes from rajkumar sir..& his book is good if you have taken classes from him.So if you can arrange his book from any of his student in which he has completed all the charts & explanations at classroom...then its good..otherwise his book is not good for self study.... 

Bangar is good for self study.