Massimo,
Unless rules have changed (which may be the case), tests taken at a PearsonVue Testing center will allow you take on-the-clock breaks any time during the exam, mark questions for review and allow you to go back to any question (or questions) you want. I believe, but am not 100% sure that the "at-home online" version has stricter rules.
Please call the testing center or PMI to find out for sure. (PMI sets the rules for the exam, not PearsonVue).
Harry