Hello Dear
UPSC doesn't Conduct the exam of bank PO. UPSC conduct the various exam in defense sector, railway, public sector etc. Bank PO exam is conducted by IBPS.
List OF exam which is conducted by UPSC is
National De fence Academy(NDA)
Combined Defence Services CDS
Special Class Railway Apprentices SCRA
Civil Service Examinations CSAT
Indian Engineering Service IES
Indian Forest Service IFS