Muymuy

Hello everyone, I found out that I got admitted to NJIT masters program for the Spring 2016 semester when I checked their website on 10/27/15. I Haven't received the official letter from the school yet. My questions are: 1.) When should I expect to receive the official letter from the school? 2.) Is their a deadline for me to accept the offer for the Spring semester? I know that some schools want students to accept the offer before the deadline. Thank you!