Hi, guys, This is my fourth time to take the writing section of CBEST. Before, I have taken three times and always got 26. The newest score report shows that I need improve usage, but the last report shows that I need improve Structure and Conventions, usage and organization. Then, I found a tutor to teach me so that I only need improve usage now. The strange thing is I still get 26 even though I don't need improve Structure & Conventions and organization. Anyway, you can see that now the biggest problem for me is usage. I don't know how to improve it. I am a nonnative speaker so I do not have a big quantity of vocabulary. What methods you can teach me to help me solve this problem? I really need to know, and I also have lost much confidence to upcoming writing test. I really appreciate your help if you can provide me useful advice.