Hi, everyone, since I am from China and preparing for the GRE now, I think I can provide a convinced answer.
You're right! :) Most Chinese students actually have got very high scores in this test, I think the code is here:
1.Not all Chinese undergraduate participate this test, it seems that only the elite attend.
2.Chinese basic education pays a lot emphases on maths, and the Q part seems really easy for every Chinese undergraduate, (most questions just relate to knowledge we have learned in high school), almost each one can easily acquire a mark above 750.
3.I would most like to introduce the method we use to crack V part. Actually, and a bit unfortunately, most books published for this part have no copy in China for sold. We can only get several illegal copies of real test questions. Many Chinese education corporation publish their own material, and several of these are excellent. Most of us use a book containing word lists, which only contains words that have appeared in the test before. Chinese students, who generally have a lower english level than any other country's student, uses 3-4 months to recite these words for about 20 times. And then they continue to do a lot of real questions, which can ensure their high marks. When computer based tests were applied in China, students will share there questions of the tests in the website for following students to study, actually, it seems that most of these recent questions will appear within one month period. However, nowadays the mode have changed to pen and pencil, and there is no such cracking.
I think some methods ( such as telling others the questions) are really immoral, but they do help. In fact, I think most of us have a poor English education and have several crucial problems in communicating in English. Nevertheless, we have the somehow called "wisdom" to get a high mark in examination because of our educational system is based on it.