Hey, I am trying to register for CMUNCE (Columbia Model UN Conference and Exposition) this year and I have some questions about it.....This is our school's first time to attend a Model UN conference so I'm very confused. Any help would be appreciated !

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The CMUNCE website says:
"CMUNCE prides itself on its small committee sizes. As such, we generally limited school delegations to 12 students or less. Schools are allowed to request more than 12 positions, but we cannot guarantee that they will be available."
But it also says:
"CMUNCE does not allow double delegations. Each country, cabinet member, or other personality of a committee will only be represented by one student."
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Does this mean that only one person would be going into one room and each school will be involved in 12 different committees?
Another thing that's confusing me is that when I was trying to register for it, they wanted us to choose 5 choices for committees that we'd like to be in but didn't ask about the countries.... so... does this mean that they would be choosing countries at random for us?
Also, if there are 12 people going to the conference from one school, does that mean all of them would be representing one country and going into different committees? Doesn't this not make sense though, if they let us choose 5 choices for the committees?
Anyone who's familiar with this, please help!!! I'm desperate !!!

(The registration is due on Friday this week)
Thanks!!