i think you can't get any psu. As above 65 marks are required to get a call from any psu in sc category. 

No as an SC student you must get above 45 to get into the PSU.

But there are chances of getting it on reservation.

All the best.

Good luck.

https://engineering.careers360.com/articles/what-are-gate-scores-for-psu-recruitment

our link will help you

All the best for your future