The Economist! A lot of those articles feel like RC passages. JY also suggested The NewYorker in a video; I feel like that publication is a bit of an easier read.
LSAC threatened banning any school that uses other standardized tests from using their data base. Articles about his can be found on Above the Law. Monopolies tend to be very protective of their territories.
YOGA! Especially cat and cow poses! Also, watch your posture during tests and avoid slumping.
http://www.chopra.com/articles/6-yoga-poses-to-help-relieve-neck-pain#sm.00001elxi6fm78cyjutbf51o0k8ar
I like the economist. I don't read it much but when I do, I feel like most of the articles' structure is very similar to RC passages' structures. Some of the topics are quite interest as well!
The Economist! The New Yorker is good as well but like @TheMikey said The Economist articles are very very similar to RC passages. And yes the topics are really interesting.