Hi,

Here is the range of rank upto which you will have a 90% chance to be selected/recruited in a certain PSU :-

1. IOCL and BARC - upto 100 rank

2. GAIL - 50 rank

3. ONGC - 75 rank

4. HPCL and BPCL - 30-50 rank

5. PDIL and RITES - upto 150 rank.

All ranks are given for general category. It is difficult to predict for OBC and SC-ST category but for OBC you can multiply each of the ranks by 2 and for SC-ST, you can multiply by 5 to get a realistic view.

Hope this helps.