My dd did exactly what you want to do...DCP after graduation. She applied just the one time, and was lucky enough to get in...she starts in Sept! But, here's the thing...you either have the right answers or you don't. Not to mention, DCP could very well be looking for certain positions...you could be accepted on your first try, then not get accepted the time you really want it to count!! I would just apply the time you want to go. I think there is an algorithm that Disney uses for online applications. Then, same for the WBI. You either hit those words/phrases that the algorithm is looking for, or you don't. If you do, you go on to the in person interview. If not, you get kicked out of the system.
I would just watch all the different boards that have info on DCP applications..you'll get a huge amount of info from those!