Preparing for your audition is crucial. It will obviously affect your acceptance but will also impact the amount of scholarship you’ll get. Most students would not be able to afford the tuition ($20,000 a semester these days) but luckily Berklee awards $47 million every year in scholarship, mostly merit-based.
If you are an international student, you won’t be able to access federal aid. Your entering scholarship will be your main help, that’s why you really want to be prepared for your audition.
I highly recommend auditioning in person as it will be a great practice for your music career. Berklee holds auditions at least once a year in most major countries. If you live too far or if the timing is not right, you can also audition online.
You should absolutely take a lesson with an alumni (like me!) or even a faculty member several months before the audition. A recent alumni will be able to walk you through the audition requirements and give you an honest opinion on your chances.
Be prepared to wait but show up in advance since that’s a healthy habit to have. If you’re on time, you’re late. 99% of success in life comes from just showing up according to wikipedia.
They will let you warm up in an adjacent room 15 minutes before your time slot but I would suggest warming up beforehand. The best thing you can do during this time is go through the sight reading exercises and do a light and slow warm up. It’s too late to practice and no need to stress your body.