Hey there
For SBI bank PO only qualification needed is graduation and thus you are eligible for the exam if you satisfy other criteria like age etc.
Check the link for detailed information
https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/articles/sbi-po-eligibility-criteria/amp&ved=2ahUKEwikpLu81a3pAhXAzDgGHbxmDacQFjAAegQIAxAB&usg=AOvVaw2qVwhNkEnbiQwq6ASG1-qX&cf=1
Check the link for online preparation for the exam
https://www.google.com/url?sa=t&source=web&rct=j&url=https://learn.careers360.com/knockout-sbi-po/&ved=2ahUKEwjtsfb91a3pAhVRyTgGHW1NC4IQFjABegQIBRAB&usg=AOvVaw2RtlUtbudWQFaIA0lBw30n
Good luck
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