Hint #1 – How To Change World Name Without Deleting It!

Firstly you must have:
– An explorer (Recommended)
– Or a Computer could do the work but it so long.
First go to the directory where your game is. (on Android it is: sdcard>android>games>com.mojang>worlds>heretheyare!)
Now right click or long press the World and rename it accordingly to your choice.
Hope this helps!