If your problems are board exam related, then just post the questions and I am sure people on this forum will be glad to help you out, Chinese or not.
To take one step further, if you have any issures/questions regarding international dentist affairs, such as how to apply US dental school, how to apply Master studies or residency, feel free to ask or plough through the threads. I am sure you will find good answers and many helping hands, again, chinese or not.... Here we help each other regardless of his/her origin.
Just my 2 cents, good luck