www.wysiwygwebbuilder.com

First i created one page and uploaded it
https://www.cracknta.com/A-diploid-orga ... ced--.html
then i changed page name and again uploaded it
https://www.cracknta.com/class12biologychapter5q3.html
now i have both the pages having same content why? when I changed page name why old one does not get removed automatically ??

The software will never remove / delete any files from the server. This is because it has no way to know which file(s) are still needed and which are not. So this requires you yourself to safely remove what you no longer need.