I believe that you only have to be enrolled at the time of application and the interview. I actually graduated (with associates degree) from my community college last spring and have been working full time to earn some money. I want to get my Ph.d in marine biology, and I can't exactly do that here (which is illinois) so my frist plan was to join the navy. Well that didn't work out for one reason or another so I was looking for another way to go down to Florida and establish residency and earn some money. I found the Disney college program and was so excited because I love everything about disney. And, plus, I've always wanted to work for Disney. So, anyways, I did my research and found out that you have to be enrolled at time of application and interview to be eligible for the program. I went and talked to my advisor to see if I could sign up for a class after I graduated, I explained to her my situation and she let me!
So yeah, I think you're ok for signing up the last semester.
