Hello dear ,

Definitely a science stream student can apply for banking exam. To apply for Bank PO examination You need to complete your Graduate degree Course in any stream from a recognised University And there is no minimum percentage eligibility criteria to apply for bank examination. you can make your career in banking sector after completing your study with science stream. For this you have to focus on Maths, Reasoning,CS,GA . Banking exams has no connection with your study background whether you are graduated with science,arts or commerce what all they need to be your graduated.

Hope this helps !