faith07 wrote:I appeared for GMAT in November and scored 600. I have six years of work exp in IT industry.
Considering my experience and the score do I hold any significant opportunity

It depends on a) what schools you're targeting at b) your overall profile c) the round of application you apply in- only a fraction of applicants who apply in R3 make get admitted because by the end of R2,schools end up filling most of the seats in their programs.

or reappearing for GMAT would be a wise decision.

Well, this depends on how much do you think you're potential is and again on what kind of schools you're targeting at.
Many people are able to improve their score considerably, some marginally while some end up getting lower scores on their second attempt.
You may wanna read a fantastic post by eternal_optimist if you're thinking about re attempt

https://www.beatthegmat.com/3-yrs-4-atte ... 72531.html
You may also wanna read some incredible insights provided by Ron Purewal
https://www.beatthegmat.com/i-concede-de ... 71615.html

Would part time MBA from US college be an option. If so, will part time MBA really help enhance my profile.

Well, you may wanna refer this thread . I have provided some inputs on PT vs FT dilemma and you'll also read a detailed response by another person. Hope that helps!
https://www.beatthegmat.com/kelley-vs-top-5-t71966.html