Senthilkumar
I would start looking at your lover scoring areas such as Executing and Closing, based on what you supplied below. I would re-read those sections in the PMBOK and any other supplemental material you are using. I would also review the previous practice test questions that you got incorrect and understand the reason why they were wrong. This was the approach I used in prepping for the exam. You should also continue to take more practice tests as well.
I hope this helps and Good Luck to you!
Kevin