Anoop,
You can find that explained in one of our video tutorials. Log in to the simulator and then scroll down. You will see the videos listed just below. Here are the names of the tutorial videos we have:
How to Start an Exam / Simulator overview
How to Activate your Simulator Subscription
How to Start a Timed or Learning Quiz
How to Pause an Exam (You can't. Here's why...)
How to Mark and Unmark a Question
How to End an Exam (and Stop/Start receiving Exam Reports via Email)
How to Review Detailed Answer Explanations
How to Reopen an Examination Report
The last one in this list "How to Reopen an Examination Report" is the one you want to watch. And then maybe also watch "How to Review Detailed Answer Explanations".