弱问下关于Enrollment Form的问题

昨天的UMN网页上有这样一段话
Please inform us if you are accepting our offer of admission by completing our Enrollment Form. If you wish to complete the Enrollment Form later, then at that time login to https://app.applyyourself.com/?id=UMN-GRAD with your PIN and password to access your admission letter and link to the Enrollment Form. Your admission letter is posted permanently.

这个enrollment form在4月15号之前决定最后要去的就是这个学校的时候才能给学校发过去是吗？？不可以接受多个学校的录取，是这样吗？？

你最后只能去一个地儿, 接受了又反悔了不太好.