GATE examination.

I need an information regarding the cut off marks in GATE,chemical engineering stream-i.e;if the exam is out of 170 how much do I need to get so as to get a chance to sit for interviews in IIT's & IISc,Bangalore.

please help me out......

It is a dream for me to get myself associated with petroleum industries. I am also looking forward to do Mtech in Chemical engineering since it has been my subject in my undergraduate course. But I will like to know that which sector in chemical engineering is most suitable for my purpose.