NEED HELP ! ASAP. Permisisons.

I have been setting up a prison server for quite a while now. It is almost a month now. I have everything set up but on thing. The server uses a plugin called rankup. You do /rankup to rankup but the problem is that it only ranks you up in the world you are in. What I want to do is so it ranks you globally. But then I figured part of it out. Since I have 3 worlds; Prison world, normal survival world, and plotme world for player shops and things like that. I made the Prison world parent of the Plotme world so that when a player ranks up in Prison world is transfers to the plotme world. That was good. But then the problem is, how do I make it so that when a player ranks up in the plotme world it transfers to the prison world.

In other words lets say I am rank [A] in the prison world. Then I do /rankup and go up to rank [B]. Okay everything good so far. Then I go to the plotme world and I still have the [B] rank, awesome. But then when I do /rankup in prison world I get ranked to [C] but then when I go to prison world I am still in [B]. I would like it set up so that no matter what world I rank up in the ranks would stay the same throughout all the worlds.

If there is another permissions plugin that can do this please let me know ASAP. You can always PM me.

If you need an example server of what I am talking about please check this server out: Original-Gamers.net. When in game do /pex, they are using permission ex.

Thanks for all your time I know it was a lot. If you need any further information about my situation I would be more then happy to give me more info. Thanks in advance.
- StevensCruz