As far as I am aware, Girish Ahuja has been replaced by Vikram Biyani in DT by ETEN. If he is returning to ETEN again, I would not recommend him. I have only got poor feedback on Ahuja sir.
i have taken tuition from Rajkumar and Sanjay Aggarwal. Both are good and I am very satisfied. Dinesh Madan is highly recommended by my friends.
Group II Eten is good .
AMA- sanjay agarwal
ISCA- All time fav. dinesh Madan sir
DT- vikram Biyani sir. (previously Ahuja sir use to teach but now-a-days biyani sir is teaching), his teaching skills are fabulous, ahuja sir was rigid and egoistic in his part, didn't solve the querries in SAP,but biyanni sir is very understanding and explains each n everything.
IDT- Rajkumar sir teaches good, eten material is also good, and yes keep an Extra material with you as aditya suggested above in this case.
Regards.
Ankit Gupta