PlayBook default wi-fi

I have 3 different wi-fi connections available at my school. One works the best and I would like my PlayBook to connect to that one by default (obviously) but it always connects to one of the other ones. Of course I could remove the other two but sometimes one connection won't work and I have to use another. Is there some easy way to set one as my default?:confused:

Under saved networks, you can drag them in the order you want them to connect, the most preferred one on top. However, since all of them are present, at times, it will go to the second one when the first one is lagged up, etc..