When will C2 to C3A promotion window will open in TCS?

Don't go... Ur salary will reduce.

better think about moving out... this is a slow poison

Once you reach to C3A then qva won't be 100% Ok promotion you will get 15% increment but qva will be deducted 30%-50%. So overall there will be very less increment

C2 is good

YOE (total), YOE (TCS) ,Tech stack

Why do u want promotion?