DO2007(ER):
Actually, you don't receive anything regarding the Big bro/sis program until you start classes in the Fall. Basically, you will receive something in your on campus mail telling you who your big is, and then there is an afternoon (this year it was during the first week) where all the 1st and 2nd years get together. Here you can meet up with your "sibling" and the traditional passing-down-of-old-exams takes place! You can also meet other MS-2's and ask any questions you might have about the school. Most people do a good job of maintaining their test files. I personally have all tests from about the past 3-4 years in my file, so whoever my little is next year will be set. And trust me, come exam time, the test file is invaluable. I believe this is a great way of doing things, since at many schools they either do not give back old tests, or make you buy them.
As far as receiving other things in the mail, it will start to come in throughout the summer. There will be plenty of stuff related to housing, immunizations, clubs, tuition, etc. Usually, classes begin the first week in September. Good luck!
MS-1
Midwestern University-CCOM