I don't remember who exactly mentioned that international people should bring the passport to the test center, but thank you very much. I never carry my passport with me, and today I wouldn't be admitted to the exam if I did not have it.
Anyways, I got the score I desired: 620! Everything went pretty smooth and I found the questions to be pretty similar to those I experienced on GMATPrep.
The forum helped with the strategies and some of you guys are so extremely smart, it is crazy! Good luck to everybody!