Ok. I got to know what to do.
@ others: If u are facing the same as mine. Please follow the steps below.
1. Go to the thread mentioned above by Brent and download a newer version of cracking tool attached by the author of the document.
2. Go to the performance summary tab, right click on any column(that can be edited) - right click - select pivot table options - go to data tab - tick the "Refresh when opening file". Save and close.
Now everytime u enter the answers and reopen the file, it will refresh showing you ur current statistics.
@Brent: I want to know what is "Sum of numbers" meant for. What do those huge numbers indicate(3913 in one of the boxes)