Hi Sourabh,
Let me tell u about my view,
In the first place, I was surprised to see that u ( sorry ur source) were only talking about gracing and leinent valuation but what SLASHING/ REDUCTION brother?? I definetly agree that there would be gracing in 1-2 subject in each attempt but there will also be SLASHING/ REDUCTION atleast in one paper each attempt
I dont see any reason as to why they should award grace marks in costing. Many friends told me that ISCA was very easy although my performance was bad. Strong reasons to believe that there will be slashing of atleast 4 marks in ISCA. In DT Correction may be lenient but I doubt that there would be gracing. Yeah IDT there may be gracing.
Cant comment on group 1 since I had not written
Remember friend, these are the times where passing percentage is low , expecting lenient correction/ gracing will result in dis-appointment. We can only dream of said correction pattern. Its always better to keep our expectations low. According to me , the information provided by your source cant be relied upon. Anyways these are only the guesses/reviews/ personal opinions, Ultimately we will get what we dont expect - to some it may be on favorable side and to some it may be on unfavorable side but for me it is surely on unfavorable side. I wont pass, I know it pretty well.
All the Best.