Do you think I stand a chance at Langone part time or I really need to take GMAT again or may be apply to Rutgers.
The first thing you need to ask yourself is how much you want the Lagone MBA or if you just want an MBA. NYU's part-time program is one of the best and it'll carry some serious weight. That being said, you know the answer: re-take the GMAT. Getting an MBA isn't a walk in the park. The good news is since it's a part-time program, there are multiple times you can start (as opposed to the fall only option for most FT programs), so re-taking the GMAT shouldn't slow you down as much.
To illustrate, here's NYU's part-time class profile. As you can see, a 550 is well below 620, the score 10% of the entering class is below.http://www.stern.nyu.edu/programs-admissions/part-time-mba/community/class-profile/