As you want to get the computer knowledge that is required for Bank PO exam so here is the information of the same for you:

You have to know very basic knowledge of computer for bank exam... if you are doing B.Sc computer science then you don’t have to worry about computer in bank PO exam at all.

If you don’t know anything about computer then just study the basics like what is input output device, CPU etc. nothing tough will be asked from computer since they want only people with some basic knowledge of computer so that they can work without any doubt in the bank