ETS has reported that TOEFL scores for Chinese students have gone up to match the worldwide average. In case you were wondering, the worldwide average for the TOEFL iBT is 78. The average score in Taiwan is 72, in comparison. I think especially in the Speaking section of the TOEFL, Chinese students have suffered when compared to many others (though this applies to Japanese students as well). One thing to remember is that if you have an accent, you should try to work on any part of your accent which might cause your words to be misunderstood. But what you SHOULD NOT do is mumble in an attempt to hide your accent. It doesn’t work, and just causes more problems.