First GMAT attempt 600

Hi Experts,

I have taken my first GMAT in the training center. I was really disappointed with my result as it is just 600 (47 Q and 27 V), 7 IR and 4.5 AWA! However, my last official gmat mock tests were 650 and 640. I want to apply for January intake in top schools in Europe. I need minimum 650, better 680. I am from Russia. I work in international oil company (4 years abroad and the last year in Russia). I have BSc (3.1 GPA) and MSc (3.9 GPA) in geophysics (Russian university).
I bought ERS result and I was very surprised. I answered 100% CR questions correctly (it was 70-90% usually in my mock tests), 55 % SC correctly (approximately the same in mock tests), and only 5% RC correctly (usually I answered around 50% correctly in my mock tests).
RC was always my weakest point, as I am not native speaker. Very often I don`t know the meaning of some words, but I understand the main idea of a sentence. My accuracy in RC depends on the text. Sometimes if I understand a passage very well, I get correct answers very easily even in 700 difficulty questions. But I have a real problem with long and difficult passages. Even I understand words, I find it very difficult sometimes to understand what author wants to say. So, on my GMAT I got long passages and I tried to use this strategy - read 1st paragraph and first 2 sentences in each of the following paragraph. Obviously, it failed. Moreover, I think I was very nervous and I was rushing. I couldn`t focus properly. May be it was additional problem.

Could any one give me a direction where I should move and what to do? I know I have to read as much as I can. I read NYT everyday, write down the word, which I don`t know, and I have finished all questions 2 times in OG. Now, I am using GMAT official advanced questions. I have been preparing for GMAT already for 6 months. I spend all my free time for it.

Thank you in advance for your answers:)