how can I score better in Q.A...?....

This is a problem which is faced by many students. Even I am facing the same problem. But there is one thing which is making my performance increasing day by day. Solving the previous year's question papers. When I first started attempting my first question paper i.e. IBPS Clerk Question Paper 2017, I was feeling really low by the results. But I never left the hope and I started solving them day and night. As a result, I started feeling confidence in solving them and also my performance also increased. I will recommend going for these papers. You can download them from the link shared above.
All the best..!!