Hello Abhi, 

Marks vs rank is not out yet generally. Last year NIT Rourkela's cut off marks for the last round of counseling (round 3)  are as follows: 

1.  OBN - 25.67

2. OCN - 31.00

3. SCN - 15.33

4. STN - 12.33

Since you know your marks, if your rank corresponds to these marks or a higher mark, then you have a good possibility of admission. 

For further details regarding cut offs of IIT JAM, visit here  :  https://www.google.com/amp/s/university.careers360.com/articles/ccmn-cutoff/amp

Hope this helps :)