Renalto,
They say that practice makes perfect, but that's not quite right. Perfect practice makes perfect.
I would start by going though all the Domains or Knowledge Areas with untimed quizzes. Do 10-30 questions at a time and check "unanswered questions." This will give you small bites at a time and also give you an understanding of how questions are going to be worded, both in the simulator and on the real exam. Make sure you go through all of the questions in each area (all 1600+ questions in the question bank.)
Every once in a while do a 100 question timed quiz. That represents half a real exam and the timer will be set for 2 hours.
Your scores will steadily improve as you learn to integrate the processes and gain a mastery of how the questions are worded to answer what they are looking for.
Hope that helps,
Harry