I heard these big names Kaplan and Princeton are good just for the sake of brand; they are very expensive and don't  bring much breakthrough . In some major cities, some locally owned test prep centers do very well which I have been referred too. I need to eat GMAT and sleep GMAT but it seems I am not getting there. It's been 3 years since I finished my Masters in Nepal and getting back to academic practice seems to be a daunting task. Please, throw your experience and any knowledge and information as how to crack the GMAT and get a higher score.