Hello aspirant,

Yes, you can be a bank manager if you're pursuing B.SC in Mathematics. Definitely you can apply for bank exams once you complete B.SC in Mathematics. No specified minimum percentage is required  so as to apply for bank examination. You can apply for IBPS PO/Clerical Post examination or SBI PO/Clerical. You have to put a lot of efforts and be dedicated in your preparation so that you can be able to secure more marks in the exams in order to be qualified for the post.

Hope, it helps you.