Rasuajak:

First, I think it amazing that anyone tries to pass the PMP in their 2nd or 3rd language.

1)  I believe you have not taken enough practice tests under time pressure.  I would suggest you practice with tests of an hour length.  When you can complete them on time, try to take a 4 hour practice test.

2)  Read PMBOK 5.  As you say, English is not your first language so reading PMBOK 5 may seem like a burden.  Reading Rita's book (I have taught from it) is a complementary test to PMBOK 5.  READ PMBOK 5.

3)  In the U.S. I have suggested people try using www.meetup.com or Craigslist to find local study groups.  You might also try using this website (with admin's permission) or LinkedIn to start a study group.

4)  How soon for 2nd attempt?  I would use a proven test resource like PMZilla.com and try testing out consistently above 70%.

5)  How many sets of 200 questions?  Take as many "sets" as you need to begin passing at 70% or beyond.  At the very least, you should be in the solid mid-sixties as a test taker.

People often talk about "taking" tests.  When I passed the PMP, I answered, studied, took notes on 1000 questions.  You might find my website post and video Am I Ready to Pass the PMP Test helpful.

Whatever you do, keep using PMZilla.com as a resource for your questions.  I wish I had used PMZilla.com more when I was studying for the PMP.

Best Wishes on Passing the PMP in 2015,

Richard Kraneis, PMP
Chicago, IL  USA