They don't send anything in the mail . You can get all approriate info on your account and on the lsac web site. About 2 weeks before he test you'll get an admission ticket with your photo and the address of the the testing center you chose.
Circular games are pretty rare, only 5 have been circle games with the last one in February 2014.
http://blog.powerscore.com/lsat/the-tenth-circle-of-lsat-hell-tiered-circular-games