So looks like the GMAC organization that runs the GMAT exam is cracking down on cheating in China.

Already in 2009, 32 scores from China have been revoked by GMAC, while 24 Chinese test-takers have been blocked by GMAC from retaking the GMAT exam for five years, GMAC says.

GMAC says that in 2009 alone, 32 scores were revoked by GMAC. Another 24 Chinese test takers were blocked from retaking the GMAT for 5 years.

There was a website (www.passion.org.cn) that was giving away live GMAT test questions (ones actually being used on the exam) for a fee.
So now there’s going to be increased security measures including the use of palm vein readers, digital photographs, and passport scanners.

GMAC also has sophisticated web crawling software to find which websites are distributing GMAT questions.