You must submit all the deposits by the date they are due in order to attend a school. You may place deposits at any number of schools if you want to hold multiple seats. In April, the schools will share their list of students with deposits down. If you hold spots at more than one school, they'll contact each other, decide who gets to send you a letter/email and tell you that you have until some date to withdraw from all but one school... or else they all rescind.