Work and NS...what has to give?

Hi everyone!

I am super excited to be enrolling in my pre-reqs to get into the LVN program! It has been a long since I have been so passionate about something...I KNOW this is what I was meant to do! My only issue is, for now I have to continue working until I am (and I WILL be) accepted into the program. I was told by some friends and my Fiance not to let my co-workers know that I am enrolling in school. I have an ideal situation because I currently work nights (not in a healthcare setting), so it allows me to do some classes for now. Well today, the VP of my department tells me that I will eventually be his administrative assistant, which would be a promotion.

Now, I am torn. I don't want them to invest all of this time in me, only to quit in less than a year. Also, there is a possibility my hours could change to day hours, then I would not be able to complete my pre-reqs. I don't want to possibly lose my livelyhood, which is helping me suppliment school. We do have an awesome reimbursement plan, but that has to get pre-approved by the VP, only taking "approved" classes.

My question is, should I have a heart-to-heart with my boss...basically letting him know that I will be taking classes that will eventually lead me in another direction? Or, should I keep quiet, until I am admitted into the program.