tubelo
I think you are wise to NOT resign your current job, until you actually have a confirmed class date. That being said, I would not concern myself too much about the 'two week notice' etiquette. While that is a nice thing to do, you can't short change yourself by skipping a life career opportunity. Companies dismiss people all the time without notice to the fired or laid off person. It should not need to be a one way street.
Just my opinion.