I wanted 700+ score..
PR will probably get you to 650....again, depends on your aspirations... You need some solid math to get in the 90th percentile.. I got a Q51 (not boasting here!!!) I and could see and feel myself improve my math in 4GMAT...
About the tutors at
PR: I just felt they did some reading before the class and taught the group.. Didn't feel convinced.. ended up scoring in 500s the first time.. I am not blaming anyone except myself here because i did NOT do my research carefully (objective self-criticism!!!)..
I strongly recommend you to take demo classes with the prep companies you have shortlisted...because at the end, your GMAT score matters... and choosing the right prep company is crucial...