So, how do I make sure May 15th, I've fulfilled all my obligation? Does this deadline mean that I simply email all-but one golden one---saying that I've declined and would like to withdraw?
Yeah you have to have accepted your position at your final choice school and dropped all other acceptance offers and paid your fee to take that spot. Like I had paid a 75 dollar and a 100 dollar fee to hold a spot at two different schools, I had to inform the school I chose not to go to that I wasn't going. I think this is correct.
For schools that did not ask for a deposit upon accepting the spot in the class, there generally isn't a new "May 15 deposit," right? I never paid a deposit to the school I want to attend. Thanks!