Admission dates for different schooling session have fixed calendar when academic session applications are received from potential candidates and when they close. These calendars are followed dedicatedly. It is up to potential candidates who seek academic career at respective institutions to start on time with documentation and credential evaluation so as to meet up with admission closing date.
Academic transcripts are usually the biggest time consumer as getting it timely is a function of the response time of your previous school. So this is were we advice you start from, if you must save time ahead.