Ramalo,
It looks like you're falling into the common trap of doing too much material. This is not the way to improve your score! It's much more helpful to do a
small quantity of material and focus on reviewing that material carefully to strengthen your understanding and your ability to make good strategic choices.
Below is a link to some questions to ask yourself as you review, along with a list of resources if you really do need more problems. As for tests, have you already purchased the two additional GMATPrep exams from mba.com? If not, treat them as a precious resource! Take one when you have made some improvements and are ready to check in, and make sure to take the full exam under official conditions. If you just want to practice, don't use an exam for that.
where-to-practice-after-og-154845.html#p1239328Good luck!