以下是小米给我的回复,意思是说如果有decision了,才寄原件的吧~~请见原文 Dear ...., In the interest of time you can upload unofficial copies of your transcripts and all your test scores (or their screenshots) to the online application form, but you will have to mail the official copies to us as soon as you get them, in order for the Admissions Commitee to be able to reach their final decision.
That means that you can hold on to your official copies as long as the admissions committee notifies you about their preliminary decision, and if it is the positive one go ahead and mail us the official copies.
Also, Enrollement certificate is fine as long as it says grades on it for the moment of submission on your application to Brandeis.
Please do not hesitate to contact IBS Admissions should you have further questions,