Kaldanina,
I think between your first and second test you concentrated on the quant part and this had an effect on the verbal part of your score.
For verbal start off by attacking SC questions. It is easiest to improve your accuracy on SC questions after a short period of time. Get yourself a copy of the Manhattan SC guide. It's the best book out there and you will be surprised by the effect it has on the way you look at SC questions.
The CR and RC portions of the test are more difficult to improve upon.
For, CR get yourself a copy of the Critical Reasoning Bible. The book is comprehensive and has details on all the types of critical reasoning questions you are likely to encounter in the GMAT.
Lastly for RC I'd suggest you read through all the passages in
the Official Guide & the Verbal Review and analyze each one of them separately. Develop a framework to analyze RC passages.
- What's the main idea and purpose of the passage ( Is it a competing idea passage / Is it an explanatory passage / etc.)
- What's the structure of the passage ( E.g - Passage One: Intro; Passage Two: Further Details; Passage Three: Flaw etc.)
- Be on the lookout for portions where there is a change in the line of thought (e.g - generally words such as 'However', 'On the contrary', 'In contrast', 'On the other hand', 'Yet', 'Nevertheless', 'But' etc. will signal a change in the line of thought).
While reading fiction might help you to develop a reading habit it might not be very useful for purposes of the GMAT. You would be better off if you read articles from magazines/newspapers such as Scientific American, Nature, The Economist, the Wall Street Journal that closely resemble the passages in the GMAT.