IBPS Specialist Officers III scores are out. You can check your scores here.
Now you should start preparations for interviews. I am going to start interview preparation series for SO.
How to start interview preparation
Books - I don't think you need any book for interview preparations
Stay updated on this blog for interview preparation questions and tips.
Read a national newspaper daily.
Get a current affairs magazine.
Read any basic course book for your specialization.
Read more banking banking and financial terms. I already made a detailed list, read that.