I'm a graduate from B.Sc in computer science after graduation. What should I do next? Can you suggest something in banking?

You can do higher study. You can do maters degree in physics, math or you can do MCA or you can do M TECH. after all this you will become a teacher or a professor. Or either works in IT companies like TCS, INFOSYS, HPCL, WIPRO...... many more. If you want to go in banking line then just start givin

You can apply for various banking sector exams such as IBPS(PO) etc.