I took GMAT on 29th September 2006 & got 610(Q49,V25).

I have done Degree in Electronics Engineering from R.E.C.,Jamshedpur in 1993.Since than I have been working with an auto component manufacturing company in the maintenance department.I have total 13 years of work experience & Iam 35 years old.
Since I felt that Iam stagnating in my present job so decided to give GMAT to further my career goals but result was contrary to my expectations.Right now Iam undecided to retake the test so Iam just asking this question.
I will appreciate your sincere responses.

Yes. Not Harvard or Yale, though. Berkeley Haas for instance has had a GMAT range in last years of 610 - 750 (in 2004), 610 - 750 (in 2003), 610 - 740 (in 2002) and 640 - 750 (in 2001). So you would probably not get into that program. But there are many other "decent" schools with lower GMAT averages.

Yes, ofcourse you can get an MBA. However I think you are confused about issues and what an MBA can do for you.
1. Being stagnant in a job you hate is not so bad, but an MBA education won't help you in that situation either.
2. Schools with higher GMAT scores, are not necessarily the key to you career advancement, unless if you want to work in one of the companies in the USA, which are most "fratenity institutes" Havarvard, Princeton, University Of Chicago, Kellogg(Northwestern), Columbia (NY) University Of New York, Wharton, the list goes on, are excellent schools if you want to be an executive in one of the many American fratenity companies. Most of them oddly enough run by CEO who hardly squicked out with a Bachelor's or law degree from these institutions. However if you want to work internationally, any acredidated education will open doors for you. Even uncredited, provided you learned the right stuff.
(3) If you want to be educated and understand management, an MBA will definitely help. But again do not confuse the need to be educated with the needc to advance in you career.
(4) Educated or not learning the culture you work in and beeing a team palyer who can handle added responisbility will launch to the top of you competence very quickly.
(5) You listed you exeperience, as if to say - "Look I have all this experienence" therefore I Must already have an MBA!" Wrong do not mix work with educatin. The work place might agree you have an MBA equivalency based on your experience. But any good school will not give a damn about that Unless you can prove it by taking SAT test in the respective subjects that you think you are proficient in. Then They will give you credit for that, usually not more than 9 hours. But if you score really high, maybe a bit more, but not enough to just get a masters, let alone an MBA.
Last but not list there are several schools who realize that the brain and people evolve, they do not put too much weight on the filter process of GMAT, rather they base their judgement (grading) of your work throughout your career.
Good luk keep it straight.