Hi karthik kumar,
the but off mark is not yet known. It will be confirmed only after the result. Depending upon the result only the cut off mark is determined. But usually the tnpsc officials will approximately fix the cut off marks every time. I hope This time for the july 2011 exam the tnpsc squad has approximately fixed the cut off marks for b.c as 160 marks, for sc and st the cut off mark is 145. It is only a approximately said by the tnpsc members. It is better that i advise you to check the internet for more details. But i am quite sure that the cut off marks will be determined only after the exam result is published. Better you can patiently wait for the result to be published. When the result comes you can know your cut off marks.
Defeat the defeat, before the defeat defeats you