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Our high school had 2 sections of AP physics. One of the students in the afternoon section, a top student in the grade, would regularly quiz the morning kids about the contents of tests. She would stay home if she thought she wasn't prepared for a test. The teacher apparently had a pretty good idea what was going on - one day he told the students in the morning class to lie and tell the afternoon kids that there was a surprise test. Sure enough, this student went home "sick." As far as I can tell, there were no consequences and she attended an Ivy.
There is a Yale Facebook group called free & for sale where kids who are leaving post a lot of stuff. This helps current students more than freshmen since peak sale time is in the next couple of months, but things are sold through the year. I have occasionally seen really nice, little-used furniture being sold for a song.
My daughter and her freshman suitemates pooled $50 each and went to Ikea and Target and got a coffee table, cute lamps, microwave, kitchen table + chairs, dishes, and also a carpet remnant from Lowes (the one in Derby had not been mobbed by Yalies). They already had a futon. Their common room looked more put together than my house! -- For about a week.
Whatever college you are in, you will be rooming with other freshmen from your residential college, and those are the people you will initially get to know and hang out with. D1 had a good friend from high school who started at Yale with her. They both lived on Old Campus, but never really saw each other there (different RC's). They are no longer close. This is not to say that you will only make friends within your residential college at Yale, but rather that you are likely to make your first friends within a few nearby freshman dorm entryways, as well as within your classes and EC's.
Call me paranoid, but one way I narrow down the hotel list is by searching the hotel name plus bed bugs. If I see recent reports, I bail. Also won't stay at hotels where people reported bed bugs and management pretends it isn't true or blames the customer. It is so much work to get rid of bed bugs that I would much rather not take even a small chance.