Good changes..but if one can change PNR prediction with the passage of time it will no longer be a prediction. If that happens i would be highly surprised if any member scores less than 95% accuracy. Number is not important be it 95 or 100 but then the crux will be gone. My suggestion is to allow changing the prediction say within a time frame of 10 or 15 minutes which would help members who accidentally clicked on a wrong prediction tab.
Thanks