Do you know the address? how much does wellbutrin sr cost Every year millions of Chinese students sit marathon nine-hour university entrance exams, some of the toughest in the world. In an effort to revise and prepare for the exams some students will go to any lengths, including private tutors and dietary supplements. The Gaokao, China’s university entrance exams, are dreaded for their ferocity, but they open a magic door to opportunity, and have become a national obsession.