What will be the next step after the clearing the Bank PO common written exam ?  How will the hiring be done  by 19 Banks

If you clear the Bank PO  Common Written Examination (CWE), Scorecards will be issued to candidates who secure minimum qualifying marks and above in each test of the examination.

Each participating Public Sector Bank will independently issue a separate recruitment notification, specifying their vacancies and stipulating the eligibility criteria in terms of age, educational qualification, experience (if any), minimum required level of IBPS score in each component test plus Total Weighted Score (if any) etc. For complete info check out minimum qualifying marks in Bank PO Common Written Examination