Unexpected results Please help!

Dear Dimitris,

I'm happy to respond.

I will say a few things. The GMAT Prep tests are close to the real GMAT, and few free tests can rival that quality. Are you familiar with the cynical assessment "free . . . and worth every penny"?

Also, keep in mind, your GMAT-readiness is not a fixed quantity, like the the performance of something mechanical. In particular, your relative stress level can make a huge difference on your performance. Many people do not appreciate this, and the stress of sitting for the real test torpedoes their score. See this blog article:
Lower on the Real GMAT than on Practice Tests
The links at the end of that article discuss stress-reduction skills.

Clearly, Verbal is your weak point. With all due respect, my friend, your written English in this post also has some flaws, the kinds of flaws very typical of an ESL learner. You need to polish your understanding of English, and the very best way to do this is to develop a habit of reading. See:
How to Improve Your GMAT Verbal Score
Don't look for a simple trick. A simple trick is not going to give the kind of broad improvement that will really help you. If you can pursue assiduously the habit of reading between now and your GMAT, you will see solid improvement.

Does all this make sense?
Mike