mera part 3 me just 50% hai to kya mai bank po ki taiyari kar sakti hu

To give Bank's PO exam you need to be a graduate with overall minimum 50% marks. So if you have completed graduation, you can start preparation for Bank's PO exam. Good luck.

What do you mean by part 3

if you belong to reserved caegory then you can and for ibps you can do the pepration as they only want the simple graduation but after wards when vacancy comes some of them ask for percentage.