Hi Guest,
Well, I would recommend staying away from practice testing for a little bit while you analyze the results of the ones you have already completed and zero in on the areas of the exam that are giving you the most difficulty. Then, I would recommend spending the majority of your time practicing these sections out of the Official Guide while spending a reduced part of your time reinforcing your mastery of the other sections.
As you near your test date, it might be good enough to go back and re-take one or two of the ManhattanGMAT exams just to have some practice taking an entire exam. In general, however, practice tests are not the best way to increase your skillset on the exam because it is very difficult to learn from your mistakes. However, these tests provide you with excellent assessment tools to focus your prep, as stated above.
Hope this helps!
Best,
Michael Dinerstein
Marketing and Student Services Associate
michael@manhattangmat.com
800-576-4628
212-721-7400