They try to discourage it, but I don't think they have ever expressly forbid it.
I've told this story before, but I knew an elder who was getting into arguments with his daughter because she wanted to go to college and he would not hear of it. He was at Bethel one day and asked Albert Schroeder (GB member) what to do, and Shroeder asked him "has she ever given you any problems before?" The elder said that no, she had not. Schroeder replied, "then why start a problem with her now?"
In other words, he got the okay from a governing body member to let his daughter go to college. I have no doubt that, during this time, they must have mentioned the "risk" of going to college a couple of times, if not more.