Ab,
Manhattan GMAT only offers 6 exams. We advise students against using the 6 exams as their only method of studying. The exams are a great tool as a diagnostic: to see how you have improved during the course of your studies and to figure out what you need to work on. With that said, there are several places where you can find additional exams. The first would be mba.com, they provide two free practice exams here:
http://www.mba.com/the-gmat/download-fr ... tware.aspxThe second would be 800score.com, they provide 5 GMAT practice tests here:
http://www.800score.com/download.htmlLet Student Services know if you need further assistance.
Best,
Noel De Freitas
Student Services Associate
Manhattan Prep