Guild Wars 2

can you que up for all the Battles at once?

Yes.
There have been Q issues of people getting before others (qd earlier) and I am not sure if Anet has said they will look at raising the cap.
They did stop the botters with the walk the yaks tho.

No, based on my experience, you can only queue one map at a time, and each time you change your queue you are put to the end. When you get into a map, you can queue another map.

I’m not sure, but something that can help your PvP craving is joining whichever one is open (if any) and then once you are in that map, queuing for the one you want.

For example, you want to join Eternal Battlegrounds, so first check that queue. Then, if there is a queue, try to join one of the Borderlands instead. Once you get into a Borderland (which usually have a shorter queue) then queue up for the Eternal Battlegrounds.