IMO, a more meaningful way to mitigate the cheating problem is to use a different, but equally difficult, test for international Asian students at test centers in South Korea, China, India, etc. Their time zones are not too far away from one another. It is quite feasible for this version of test to be done starting and ending at the exactly time so that test leaking due to test timing lead-lag is less likely.
This will introduce additional cost of designing tests for standardized test agencies, but should not be too high on a unit cost basis, because of the sheer size of international Asian students taking these tests.
The additional cost can be mostly passed on to those international Asian students as well if so desired. For SK, this is a country that postpones the opening of their stock markets and closes down nearby airports for their college entrance exam. The fee of taking an exam, by comparison, is like almost nothing. Overall, differential pricing can be actually much cheaper than having all of the students travel far to a central location.
To understand the will and resources behind the alleged cheating into a US college, I provide the following quotes:
“Korean children spend 220 days a year in school versus 190 in Finland and 180 in the United States. By some measures, the average Korean child spends 13 hours a day studying after supplemental class time is factored in.”
“Just 10,000 of 550,000 high-school graduates win places in the country’s top three universities (SKY) each year. This dearth of top universities is a major contributing factor to the annual departure of tens of thousands of Korean students to overseas universities, mainly in the United States.”
“The United States is far and away the most popular destination for Korean students studying overseas. Of the more than 126,000 students who were studying abroad in 2012, over 72,000 were enrolled at U.S. universities (IIE Open Doors: 2012) — third overall behind China and India, despite having a population that is less than 1/20th of those nations.”
“In addition to English fluency, a major competitive edge in the Korean job market, parents are often looking to spare their children from the notoriously competitive and exam-focused Korean school system by sending their children abroad.”
“In South Korea, grim stories of teen suicide come at a regular clip.”