Hi Manjus,
I haven't heard much feedback about MGMAT, but I do really like some of their course materials. Private tutoring is VERY expensive especially when it's with one of the larger companies. I recommend studying as much as you can on your own, taking a few practice tests, practicing different strategies for the Q types and then make the decision.
How have you been studying so far? Or are you brand new to GMAT? Either way, I think you can do a great deal on your own and improve tremendously independently, so that when/if you do seek a tutor's help, you'll be able to get a lot more out of the sessions.
Full disclosure: I am a tutor for Grockit and we offer one-on-one GMAT tutoring online for $50/hr. There are a lot of options to consider!
Good luck to you!
-Vivian
