Although I didn't get a high score....., in my case, I got better score in sample test(powerprep), about 230-283, but I only got 203-260 in the real test. The listening part is a little bit different from the TOEFL pp. You may encounter more complex type of question than in TOEFL pp, so, be careful.
About the TWE, you should really spend time on it. I probably cannot reach 250 finally because of my poor essay.