How is rajkumar for idt and girish ahuja for dt?

RajKumar is Good for IDT, VG is better for DT, Girish Ahuja Sir's book is good , easy language and not so lengthy, VGs Summary Module should be used  for revisions 

As regarding Reference Book, refer books of the author from whom you are taking classes and regarding time required for 1 reading, DT will take approx 150- 180 hrs, IDT should take around 90-120 hrs

I am confused b/w Bangar and Vineet Sodhani. Old is definitely gold but what do you suggest guys?

With regards to DT, is TN Manoharan Book good? N does VG modules have enough problems.